[rchaud]

Well this would have to be a special kind of bread where the inventory amount does not change when a loaf is consumed.

Bear in mind, this loaf can also only be eaten inside of the grocery store. You cannot leave the store with the bread, because it is welded to the infrastructure of the grocery.

Not paying for a gym membership would be a better example. You're using up available capacity without giving the gym a way to monetize your presence there.