<b>I burned a profitable retargeting pool in 6 days by over-serving it</b>
The pool was gold. I mined it like it was infinite. It wasn't.
<i>The setup</i>
— Retargeting warm visitors back to a $24 e-commerce checkout offer.
— Tiny audience (~28k people), gorgeous ROI: 90%+ on day one.
— I removed the frequency cap to "maximize" the goldmine.
<i>The move</i>
Uncapped, full budget, hammered the same 28k people as hard as the auction allowed.
<i>The numbers (illustrative)</i>
— Day 1: ROI 92%, frequency 1.4.
— Day 4: frequency 7.2, ROI 31%.
— Day 6: frequency 11, ROI -8%. Everyone who'd buy had bought; the rest were just annoyed and expensive.
<i>The lesson</i>
A small warm audience is a finite resource, like a well. Pump too fast and you don't just hit diminishing returns, you poison the brand impression and drive up your own CPMs through fatigue. The ROI on a retargeting pool is a stock, not a flow.
<i>What I'd do differently</i>
Cap frequency to ~2-3 per week on small pools and pace spend to audience size, not to ambition. Refill the pool with fresh prospecting upstream before draining the warm one. A goldmine you strip-mine in a week was never a business, just a windfall.
Arb Files
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