When Your Best-Performing Campaign Is Your Worst Investment

The Paradox

In every account audit, we see the same pattern: branded search is the highest-ROAS campaign by a factor of 3-5x. It has the best conversion rate, the lowest CPA, and the most "efficient" spend. Agencies highlight it in reports. Dashboards put it at the top.

But high ROAS doesn't mean high incrementality. When someone searches your exact brand name, they already intend to buy from you. The ad might make it 0.5 seconds faster to reach your site. That's a navigational convenience, not demand creation.

The paradox: your "best" campaign has the highest reported return and the lowest actual incremental value. Meanwhile, your generic campaigns - the ones showing 3x ROAS that agencies want to "optimise" - might be driving 90% of your genuinely new revenue. This is the same dynamic that makes PMax an expensive brand campaign.

Brand Cannibalisation

Brand cannibalisation happens when paid ads claim credit for organic traffic. Google Search shows your organic result below your paid ad. The customer clicks the ad. Google charges you £0.30. The conversion is "attributed" to the paid campaign. Without the ad, the customer would have clicked the organic result and converted anyway.

Academic research consistently shows that 50-80% of branded search ad clicks are cannibalised from organic. That means for every £1,000 you spend on branded search, £500-800 is wasted on traffic you would have received for free. At scale, this represents your single largest source of invisible waste.

The Incrementality Test

The only way to know the true value of any campaign is to measure what happens when you turn it off. For branded search, this is relatively low-risk because your organic listing still captures most of the demand.

Run a geographic holdout: pause branded search in one region for 4-6 weeks. Compare total revenue (paid + organic) in the holdout region versus control regions. If total revenue barely changes, your branded search was almost entirely cannibalising organic. If it drops 10-20%, that's the true incremental value.

Most brands are shocked by the results. A £5,000/month branded search campaign often produces less than £500/month in truly incremental revenue. That budget redeployed to generic campaigns or properly tested channels typically generates 5-10x more actual growth.

What the Data Shows

Across our client base, branded search incrementality ranges from 10-40%. That means 60-90% of branded search spend is wasted. The brands with higher incrementality tend to have strong competitors bidding on their brand terms, making the defensive value real.

Conversely, brands with weak or no competitor brand bidding see incrementality as low as 5-10%. If nobody else is bidding on your brand name, you're essentially paying Google to redirect traffic from your free organic listing to your paid listing. It's a tax on brand awareness that you've already earned.

Restructuring the Investment

This doesn't mean eliminating branded search entirely. It means right-sizing the investment. Steps:

• • Test incrementality: Run a holdout to establish your baseline
• • Monitor competitor activity: If competitors bid on your brand, maintain defensive presence
• • Reduce to minimum viable presence: Often exact match only, manual CPC, position 1 target
• • Reallocate savings: Move freed budget to campaigns with proven incrementality
• • Re-test quarterly: Competitive landscape changes; so should your branded strategy

Next Steps