Amazon isn’t just a marketplace; they’re a high-stakes landlord. This guide exposes seven margin-killing mistakes, from paying the 5% “AMZL penalty” on non-Amazon orders to falling for the “End-of-Month Snapshot” storage trap. Learn why FBA’s per-unit fees punish multi-unit sellers and how predatory “Aged Inventory” surcharges can hit $5.90 per cubic foot. We offer a “Daily Wins” strategy with prorated, aggregated billing and actual return inspection. Stop the bleeding, reclaim your margin, and use our FBA Drip-Feed model to stay lean and profitable in the 2026 landscape.