I don't know. On the one hand, I don't like pre-paying for electricity considering the potentially huge fluctuations in use. On the other hand, I don't use gas

I don't know. On the one hand, I don't like pre-paying for electricity considering the potentially huge fluctuations in use. On the other hand, I don't use gas and then pay for it. I eat at a restaurant first, then pay, but I buy groceries before I eat. So I don't know. I can see phone as being a purchase of a block of X to use. The same with rent. Almost all internet comes with an uptime guarantee - say it's 99.9%, if it's down for more than 45 minutes, even Comcast will provide a credit. I suppose it comes down to how you agree to consume it. I don't mind the 24 hour model on video rentals, when I can start that 24 hours any time within 30 days. I'm purchasing the right to watch the movie as many times as I want in a 24 hour window sometime in the next month. That said, I also believe that if I purchase unlimited video in the form of a DVD or download, I have the right to device-shift it wherever the heck I want. This is a hairy issue.