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TL;DR
- ROAS stays useful when you read it inside one retailer and within specific placements. Once you carry it across retailers, the comparison gets noisy unless you bring context with it.
- Every retail media network behaves like its own environment. People shop differently, products appear differently, and performance attribution varies greatly.
- Strong retail media strategy starts retailer by retailer, using insights on a retailer-by-retailer basis to meet the customer where they are in their shopping journey.
- Price, availability, and assortment shape shopping outcomes in ways ROAS does not show.
- Reporting is most valuable when it connects ad spend to product-level outcomes and uses the language that aligns with the business
On the weekly call with the retailer’s ecommerce team, the deck opens with ROAS (return on ad spend) and a tidy spend line. Everything looks good, until someone asks about which products are they trying to move the next week. Answering that question requires looking beyond the fast sellers to address the products that haven’t been as successful to find out how to change that.
It’s easy to keep spending on the products that already sell efficiently. Brands and retailers also have other priorities, like giving a new launch enough visibility to earn repeat purchases, supporting a focus line ahead of a seasonal moment, or putting weight behind an item that reliably introduces shoppers to the rest of the brand. That’s why ROAS belongs in the overall update, but it won’t tell you whether the budget supported the week’s priorities.
Picture a snack brand whose variety pack always delivers strong ROAS. Left alone, the plan keeps feeding that winner. Then the retailer flags next week’s focus: a new flavor launch tied to a seasonal feature. The brand shifts some spend to the new item and a few related products shoppers often buy together. The report may still credit the variety pack, but the plan does the job the retailer asked for, and the brand can watch whether more of the lineup starts moving.
What ROAS tells you, and what it can’t
ROAS is a strong efficiency signal for retail media strategy. Within one retailer, with consistent placements and stable measurement, it gives teams something practical to steer by when they manage bids and pacing.
But overall brand profitability is a separate question. There are many dependencies for that level of measurement, including products sold, margin on the items that absorbed spend, and whether the outcome matched what the business needed that month. Those details often live outside the ad platform view, even on teams with solid measurement habits.
A high ROAS can also happen when spend simply follows the easiest conversions. Budget concentrates on the fastest conversions, product conditions change midstream, and the report still looks strong. Nothing is “wrong” with the metric. It just doesn’t explain whether the spend supported the products the business needed to move.
Retail media strategy is unique to each retailer environment
Retail media networks don’t follow one set of rules. A single approach template can feel efficient, but it smooths over the very differences that drive performance. What tactics may work in Amazon may not resonate the same in a Walmart or Target Roundel.
Rithum points out just how scattered retail media still is: more than 220 networks, and each retailer reports results in its own format.
Assortment varies by retailer, and a brand’s winners in one store may not even be listed in another. Shoppers also bring different expectations depending on where they shop, which changes how they respond to ads and merchandising. Retailer programs add another layer, from exclusives to promotion structures that alter which products deserve investment. Reporting varies as well, sometimes in small ways and sometimes in ways that change what a familiar metric appears to mean.
Start by assuming the retailers won’t behave the same way. Then you can plan around the few things that change every time.
What changes from retailer to retailer:
- Assortment
- How shoppers behave
- How results get measured and reported
Even one of these differences can force you to change plans. When combined, a one-size-fits-all or copy-and-paste strategy is risky.
A retailer-by-retailer retail media strategy that holds up
- Decide what this retailer needs to do for you
Start with intent before you touch the media plan. You need to ask what is this retailer supposed to deliver?
Some retailer environments are volume drivers, while others are where shoppers discover and compare brands in a category, and still others matter because the relationship shapes promotions and visibility beyond media. Those differences should guide which placements you prioritize, which products get budget, and what you consider a good week.
If you skip this step, the conversation turns into a debate about numbers that weren’t built to match. Rithum helps clients to look beyond the biggest networks, where a brand can often reach new shoppers and earn more visibility for the same effort.
- Choose the products that deserve the budget
The question worth answering every week is what products is the retailer trying to sell more of next week?
For instance, imagine a brand that sells both pantry staples and premium seasonal items. Last week’s ROAS winner might be the staple that sells year-round with a predictable conversion rate. But this week, the smarter list could look different. The retailer has a seasonal event running, the premium item is in stock and priced competitively, and the brand needs to build visibility for it before the moment passes. Meanwhile, a different product might be selling fine without paid support, or it might be tight on inventory, which makes it a poor candidate for extra spend.
The right product list won’t be the same everywhere. Each retailer has a different assortment, different shoppers, and different moments week to week.
Advertise based on where your target consumers are in their shopping journey. People come to each retailer with a purpose. Some visits are quick purchases; others are browsing and comparison. Creative works better when it matches that mindset instead of forcing one generic message everywhere.
Retailer programs and exclusives matter here too. A promotion, a bundle, or an exclusive item can change which products make sense to push that week.
- Keep ads synced with what shoppers can buy
Prices can change overnight. Inventory can tighten without warning. Monday’s campaign leans on the hero product; by midweek, shoppers can’t buy it, and the ads keep sending traffic anyway.
Rithum’s Product Feeds materials describe low-latency syncing for inventory and pricing, with near-real-time changes to price, stock, and new items, with the stated goal of reducing wasted ad spend and preventing out-of-stock recommendations.
- Don’t let fast sellers swallow the budget
Retail media spend tends to gravitate toward a handful of products that already convert. The signal is clean, and dashboards keep reinforcing the same winners.
That pattern can crowd out the products you’re trying to grow. A best seller keeps getting budget because it makes ROAS look great, while a new line never gets enough exposure to prove itself.
Rithum’s retail media advertising materials describe product-aware optimization that leverages inventory, pricing, and margin data insights powered by RithumIQ.
- Translate unique retailer metrics into business terms
Retailers deliver performance data in their own formats, and standard metrics aren’t consistent across networks. Comparisons can still be useful, but they require clear definitions before anyone draws conclusions.
Rithum’s retail media advertising materials also describe closed-loop reporting that ties spend to sales at the ASIN level for profitability measurement.
The scenario where ROAS is enough
ROAS can carry more weight when a program stays inside one retailer, within a stable set of placements, and the assortment doesn’t change much week to week. In that setup, the comparison is cleaner.
As soon as a program spreads across retailers, the differences return. Assortment, shopping behavior, merchandising, and reporting depth still vary enough to change what “good” looks like.
Where tools help, and where they don’t
Most teams already know retailers work differently. The hard part is execution: keeping product reality, campaign decisions, and reporting connected without rebuilding the workflow every week.
Rithum’s public materials describe product-aware optimization that leverages inventory, pricing, and margin data insights powered by RithumIQ, along with closed-loop reporting that ties spend to sales at the ASIN level for profitability measurement.
Tools don’t replace judgment. They can make a retailer-by-retailer approach easier to run consistently.
ROAS belongs in the update, but profit terms live at the product level. Look at the items that received budget in each retailer, the margin behind those sales, and the total margin dollars the week produced. Keep price and in-stock status in view at the same time. That view makes it easier to judge whether the budget supported the week’s priorities, not just the items that earned the cleanest attribution. Learn more about retail media strategy and how Rithum can help.
Talk to our teamMeghan Barden is Director of Global Retail Media at Rithum.
