No. And I would expect anti monopoly laws legislation to outlaw this in any halfway civilised country (altho I wouldn't hold out much hope for America).
"The toaster oven will only accept certain co-branded bread and other marked-up food products: any attempts to cook other food will throw an error message; “Unauthorized Bread.”"
Assuming it was in the form of: You pay the total value in rent, and each month $500 is added to your amazon balance (I'm assuming that's how such a plan would feasibly work in practice)... then, yeah sure. Of course, the devil is in the details, but taking the deal just at face value, yeah it's profitable why wouldn't you do it?
Even if you bought stuff you didn't need, but you could resell later for a 20% loss after fees, that's still essentially a free $400 a month just for holding onto some merchandise in your closet temporarily. That's probably worth it for most people.
"The toaster oven will only accept certain co-branded bread and other marked-up food products: any attempts to cook other food will throw an error message; “Unauthorized Bread.”"
Barely fiction: Keurig, Juicero.