I'd love this. And wouldn't mind paying a small upcharge (long as it is reasonable.)
I'm really hoping that's where the market is headed. You buy it - it's yours and you can use it however you like.
Hell, I could even get behind DRM as long as this was the case. Portability is my primary problem with DRM. Second, of course, being the "the moment they turn off their servers you're screwed" thing.