When Your Catalogue Becomes Your Enemy
Conventional wisdom says more products means more opportunities to sell. In Google Ads, the opposite is often true.
Brands with 5,000+ SKUs face a paradox: the larger your catalogue, the harder it is for Google's algorithm to optimise effectively. More products means more noise, thinner data, and worse performance per SKU.
Why Large Catalogues Underperform
Data dilution: Google's Smart Bidding needs conversion data to optimise. With 10,000 SKUs, most products get fewer than 5 clicks per month. That is not enough data for the algorithm to learn anything meaningful.
Budget fragmentation: A £30,000 monthly Shopping budget spread across 10,000 products is £3 per product per month. Most of your catalogue gets zero impressions.
Feed quality degradation: The more products you have, the harder it is to maintain feed quality. Titles, descriptions, and images degrade as you move from your top 100 products to the long tail.
Algorithmic confusion: Performance Max works best with clear signals. A catalogue of 10,000 products with wildly different margins, conversion rates, and competitive positions creates noise that the algorithm struggles to parse.
The 80/20 Reality
In virtually every large-catalogue account we audit, the pattern is the same:
- 20% of SKUs drive 80% of revenue
- 40% of SKUs have received zero clicks in the last 90 days
- 15% of SKUs have negative contribution margin after ad costs
- The top 100 products subsidise the bottom 5,000
This is not a Google Ads problem. It is a catalogue management problem with Google Ads consequences.
The Segmentation Solution
Tier 1: Heroes (top 5% by contribution margin)
Dedicated campaigns, aggressive budgets, premium feed optimisation. These products justify individual attention.
Tier 2: Performers (next 15% by contribution margin)
Grouped campaigns with moderate budgets. Feed titles optimised at category level. Regular performance reviews.
Tier 3: Long tail (next 40%)
Catch-all campaigns with conservative bids. Basic feed quality. Monitored for breakout products that should move to Tier 2.
Tier 4: Zombies (bottom 40%)
Products with zero or negative contribution after ad costs. These should be excluded from paid advertising entirely. Let them exist on your website for organic traffic but do not pay to promote them.
The Exclusion Conversation
Telling a brand to stop advertising 40% of their catalogue is uncomfortable. But paying to promote products that lose money is worse.
Exclusion is not giving up on those products. It is acknowledging that Google Ads is not the right channel for them. Some products sell through organic search, email marketing, or marketplace listings. Not everything needs paid traffic.
Implementation Reality
Segmenting a large catalogue is not a one-afternoon task. It requires:
- Full margin data by SKU (COGS, shipping, return rates)
- Historical performance data from Google Ads
- Feed management tools that support tiered optimisation
- Ongoing monitoring as products move between tiers
This is the kind of work that separates commercial Google Ads management from "set it and forget it" agency relationships.
If your agency manages your 10,000-SKU account with a single Performance Max campaign and calls it optimised, they are managing complexity by ignoring it.