Catalog and retargeting campaigns almost always post the best ROAS in the account. That is structural, not a sign of strong targeting or creative work. These campaigns sit closest to the purchase decision, so they get credit for a sale the customer had largely already decided to make somewhere earlier in the journey.
Why bottom-of-funnel ROAS is misleading on its own
Attribution models tend to favor the last meaningful touchpoint before conversion. For a catalog or retargeting ad shown to someone who already viewed the product, added it to cart, or visited the site multiple times, that touchpoint is often the easiest one to claim credit for. The platform reports it as a high-performing campaign. In reality, it may have closed a sale that prospecting, organic content, or word of mouth had already set in motion.
This is not a flaw unique to one platform. It is a structural feature of how conversion-window attribution works across most ad platforms. The closer a campaign sits to the purchase, the more credit it accumulates, regardless of how much actual persuasion happened inside that specific ad exposure.
Where this creates a blind spot
For fashion and accessories brands running heavy catalog spend, this shows up in a specific pattern. The account looks efficient because bottom-of-funnel numbers stay strong quarter over quarter. Meanwhile, prospecting campaigns, which are the ones actually introducing the brand to people who have never bought before, show comparatively weaker ROAS because they carry the harder job of generating a first purchase decision from someone with no prior context.
When budget decisions get made purely on ROAS, prospecting is the first line item to get cut. It looks like the underperformer. The account's blended ROAS may even improve in the short term after the cut, since the remaining spend is concentrated in the naturally high-performing catalog and retargeting layer.
The quiet cost of cutting prospecting
The cost shows up with a lag. Fewer new people enter the top of the funnel, which means fewer new people are available to retarget six to eight weeks later. Catalog and retargeting campaigns start running against a shrinking pool of warm traffic. ROAS on those campaigns may hold for a while simply because spend is also shrinking in proportion, but the absolute number of new customers acquired starts declining.
By the time this shows up clearly in new customer counts, the underlying cause, a prospecting cut made months earlier, is easy to miss because it is no longer the most recent change to the account.
What to check
Look at what share of total spend has gone to catalog and retargeting versus prospecting over the last two to three months, not just the current week. A consistent decline in prospecting share while blended ROAS holds steady or improves is the pattern to watch for.
A second useful check is new customer count as a raw number, tracked monthly, separate from ROAS. If blended ROAS is flat or improving but new customer count is declining, the account is very likely running down its supply of demand rather than generating fresh demand.
What this does not mean
This is not a case against catalog or retargeting spend. Both are efficient at converting demand that already exists, and cutting them entirely would waste that demand. The point is balance. Prospecting needs enough budget and enough time to build a pipeline of new visitors, so that catalog and retargeting have a growing pool to convert rather than a shrinking one.
FAQ
Why does retargeting always show higher ROAS than prospecting?
It sits closer to the purchase decision, so attribution models give it credit for demand that was often generated earlier in the funnel by other campaigns or channels.
Does high blended ROAS mean the account is healthy?
Not on its own. Check whether prospecting spend and new customer count have been declining. Blended ROAS can look fine while acquisition quietly shrinks.
Should catalog spend be reduced?
Not automatically. The goal is balance between prospecting, which builds the pipeline, and catalog or retargeting, which converts what prospecting has already built.