Most resellers think they lose money because they source bad products. They don't.

They lose money because they have no idea what's actually sitting in their inventory.

I've seen flippers with 200+ SKUs across Amazon and eBay who couldn't tell you their actual cost basis on half their items. They're "profitable" until they sit down and realize they've been holding dead stock for 4 months that's now worth 60% of what they paid.

Here's the real math:

Storage costs + opportunity cost + price depreciation = the silent margin killer.

A $50 item you hold for 90 days that sells for $55 isn't a $5 profit. Factor in storage, the time your capital was locked up, and what you could've bought instead — you probably lost money.

The fix is boring but it works: track everything. Every item, every cost, every day it sits unsold. The resellers who scale past $10k/month aren't better at finding deals — they're better at knowing exactly what they have and when to cut losses.

That's exactly why I built StockPulse. If you're serious about treating reselling like a real business, not a side hustle — check it out.