If you're always listening to new music, that makes sense. But are you really? Or are you listening to the stuff you already know and like, with an occasional sprinkling of new music? My impression is that most people are more in the latter group than the former, and at that point you need to consider whether you come out ahead if you buy music rather than renting it. I know that I personally would waste a ton of money paying for Spotify, because I'm 99.99% listening to the music I already know and like.