If the RIAA is lurking here, I'm only kidding.
It's a good way to get a mix that suits your tastes. My player is filled with accordian music, SS marches, and Zamfir Master Of The Pan Pipes at the moment. It's one way to make sure that nobody sits real close to you on the bus...
You mean I'd have to show up? Jeez, free labor from a technodude isn't as easy as it used to be. Tech job market must be looking up.