It would be difficult to _avoid_ a headshot. Give me slow, lumbering, walking mosquitos any day...

Paying for something, being allowed to listen to it, not being allowed to keep it, and the person you got it from being allowed to change the rules for its further use*... Sounds, as far as I can tell, like renting. I wouldn't be interested in that, especially not at roughly the same price as I'd buy a cd**, I don't think too many others would either, and I guess someone figured that out and decided to call it "buying" anyway.

*No, it's not retroactive, unless you suddenly have to pay more for the time you've already used it, or something like that. The original deal can be that you can play the music on five computers, and then they change that to three so on two of the computers you've copied it to it doesn't work anymore, but that means that you can only play the music on three computers from now on. It doesn't mean that you never heard the song on those two computers.
**Which I stopped doing years ago anyway, when the price touched 30USD (in Norway), but hey...