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You're bidding against lower prices you don't know exist
Every dollar you spend on paid search or social ads sends traffic to a landing page. But if a competitor dropped their creatine by $6 yesterday and you haven't adjusted, your ads are directing customers straight to a better deal.
You're not losing the click — you're paying for it, then losing the conversion. Supplement price alerts would have surfaced that drop before your morning campaign review. Without them, you're optimizing ads against a competitor landscape that stopped being accurate 24 hours ago.