In episode 120 of Performance Marketing with Fexingo, Lucas and Luna uncover a hidden ROAS killer hiding in plain sight: Amazon PPC campaign group structure. Most sellers lump products into broad campaign groups, but that convenience creates data fog and budget bleed. Lucas walks through a real case study of a supplements brand that ran 72 SKUs under one campaign group, only to discover their top product was subsidizing a money-losing variant. They break down how to segment campaign groups by margin tier, bidding strategy, and lifecycle stage. If you manage Amazon PPC and have ever wondered why blended ROAS looks fine but actual profit stinks, this episode gives you the fix. Specific numbers, examples, and a framework you can apply today.