[jdietrich]

Vendor lock-in. You buy the razor because you want to use the blades, you buy the blades because you already have the razor. If you've got $400 in sunk cost sitting on your kitchen counter, you're far more likely to buy the proprietary pouches and far less likely to buy a carton of juice from the grocery store. That psychology is integral to the business model, it's what creates the promise of sustainable high margins. Nobody invests $120m in a startup juice company with no market share.