1.Why does CPA increase when I scale my Facebook ads?
CPA increases when scaling because you expand into colder audience segments that require stronger persuasion to convert. Warm traffic converts on novelty and intent alignment. Cold traffic needs clear mechanism explanation, well-timed proof, and deeper emotional tension. If your ad’s structure is shallow — relying on hook shock or narrow emotional triggers — it breaks under the stress of cold expansion. Strengthening mechanism clarity, proof depth, and tension framing makes ads scalable.