Kill rule by spend vs by CPA — most buyers use the wrong trigger

Kill rule by spend vs by CPA — most buyers use the wrong trigger
Kill rule = the loss line where you pause a creative. Two ways to set it:
— By spend (kill at 1.5x your CPA with zero conversions) → fast, brutal, right for cheap offers where data comes quick.
— By CPA (let it run, kill when cost-per-result holds 30% over target across 50+ clicks) → slower, fairer to high-ticket offers with thin volume.
Cheap offer, high volume → spend-based, axe fast. High payout, slow data → CPA-based, give it room.
Using one rule for every offer? That's why you kill winners and keep losers.