I actually like the idea. Many things pay-per-use are actually cheaper unless you use it basically constantly, because if it isn't cheap enough, many people would stop using it, thinking: is listening to it right now really worth X amount? People have a strange attachment to the concept of ownership, so that they are willing to pay extra for it. Pay-per-use is actually a more profitable concept only when people are hesitant to buy something fully, because they are not sure if they would use it enough.