I had a call last week with a brand spending $35,000 a month on Amazon ads. Their ROAS had been dropping for three months. The ad agency recommended increasing spend by 20 percent and testing new keyword targets.
We looked at the listings.
Forty percent of their backend tags had decayed. Image requirements had changed two months ago and twelve hero images were out of spec. Three top-selling products had variant relationships that silently broke during a feed update.
The ad agency never saw any of that. They were not supposed to. That is not their job.
But somebody's job has to include looking at both sides at the same time. And right now, for most brands, nobody's does.
The ad agency sees impressions drop and adjusts the bid. Nobody checks whether the listing underneath it broke.
The structural problem nobody talks about
Most brands have their ecommerce operations split across multiple companies. An ad agency handles paid media. Maybe a content agency handles listings. A third party manages the feed. The brand's internal team tries to coordinate between all of them.
Each vendor does their job well. The ad agency optimizes CPCs and ROAS. The content team writes good copy. The feed manager keeps things running.
But there is a gap between those jobs that nobody owns.
When ad performance drops, the ad agency looks at the ad account. They see the numbers and adjust. They cannot check whether the listing's backend tags decayed, whether images fell out of spec, whether a pricing error on one marketplace is suppressing the Buy Box. That is not in their dashboard. That is not in their contract.
And the listing team, if there even is one, does not know the ad campaign just shifted strategy because nobody told them.
The conversation that never happens
Here is what happens under one roof.
The ad manager sees that a product's impressions dropped 40 percent on Tuesday. She walks across the room and tells the catalog team. The catalog team checks the backend and finds that Amazon changed a browse node requirement over the weekend. The tags are invalid. They fix it. Impressions recover by Thursday.
Total cost: two days of lost visibility and zero wasted ad spend, because the ad manager paused the campaign on that product until the listing was fixed.
Here is what happens when those functions live at two companies.
The ad agency sees impressions drop. They adjust the bid. They test new keywords. They send a report at the end of the month showing increased CPC and declining ROAS with a recommendation to refresh the creative. Nobody ever checks the backend tags. The brand spends three weeks pushing ad dollars into a listing the algorithm is not surfacing properly.
Total cost: three weeks of wasted ad spend, plus the organic rank erosion that comes from a listing losing momentum on the platform.
Same problem. Two very different outcomes. The variable is not talent or budget. It is structure.
It goes both ways
This is not just about ads catching listing problems. It works in the other direction too.
The listing team rebuilds content for a product line. New titles, new bullets, new A+ content. Under one roof, the ad manager knows that happened and adjusts keyword targeting to match the new copy. The content change and the ad strategy work together.
When those teams are at different companies, the listing gets updated on Monday and the ad campaign keeps running Tuesday's keywords against Monday's copy. The new title emphasizes different features. The ad is still targeting the old ones. The click-through rate drops and nobody can figure out why.
Pricing is another one. If the pricing team adjusts a product's price to move slow inventory, the ad team needs to know because the margin just changed. The ROAS target needs to shift. The campaign budget allocation needs to account for it.
At two companies, those conversations happen by email two days later. Under one roof, they happen before the price goes live.
Why this keeps happening
The multi-vendor model is not built by brands that want fragmented operations. It grows naturally.
A brand launches on Amazon and hires an ad agency. Sales grow. They expand to Walmart and bring on a feed management company. They need better content and hire a content team. Each addition makes sense on its own. Nobody designs the gaps between them. They just appear.
And then the brand spends a growing amount of internal time coordinating across vendors. Relaying information between teams that do not talk to each other. Translating one vendor's report into context another vendor needs. Chasing down answers to questions that cross boundaries.
That coordination work becomes a hidden cost. It does not show up on any vendor invoice. It just eats internal bandwidth.
What the one-roof model actually means
It does not mean one person does everything. It means one team shares context.
The ad manager knows what the catalog team changed this morning. The catalog team knows which products are getting ad spend this week. The pricing team knows what campaigns are running before they adjust a margin. The content team knows which products the ad team is about to push.
That shared context is not a luxury. It is the difference between diagnosing a problem in two days and spending three weeks treating symptoms.
Who this is for
If you are running a small catalog on one marketplace, the multi-vendor model is fine. The gaps are small enough that one person can bridge them.
If you are managing hundreds to thousands of SKUs across multiple marketplaces, those gaps get wide. The coordination cost grows. The number of things that can break silently between vendors multiplies. And the diagnostic conversations that save you money never happen because the people who need to have them work at different companies.
That is the brand we built Ross Commerce for. Not because we want to replace every vendor. Because some catalogs are complex enough that the structure matters as much as the talent.
Common Questions
Why does it matter if the ad team and listing team are at the same company?
Because the most common ecommerce performance problems happen in the gap between ads and listings. When tags decay, content goes stale, or pricing drifts, the ad team sees impressions drop and adjusts bids. The listing team does not know the campaign shifted. Nobody checks whether the listing itself broke. Under one roof, that diagnostic conversation happens the same day.
Is this just about saving money on ad spend?
It starts there, but the impact is broader. When ads and listings are coordinated, content refreshes align with campaign strategy. Pricing changes are reflected in ad targeting before they go live. Promotional calendars are built with ad support already planned. The entire ecommerce operation moves as one system instead of three or four separate ones.
What is wrong with using multiple specialized agencies?
Nothing, in principle. Each vendor may be very good at their job. The problem is that ecommerce performance depends on things that cross vendor boundaries. Ad results depend on listing quality. Listing quality depends on data accuracy. Pricing affects ad margin targets. When those functions live at separate companies, the coordination falls on the brand's internal team, and the conversations that catch problems early do not happen.
How quickly can you spot a problem compared to a multi-vendor setup?
In our experience, the typical gap is days versus weeks. Under one roof, a listing problem can be identified and fixed within 24 to 48 hours because the ad team notices the performance shift and the catalog team is right there to diagnose it. With separate vendors, the same problem can go undiagnosed for two to four weeks while each vendor troubleshoots within their own scope.