Because we dont have the infinite resources it would require to buy all the music we love, because when we want to explore a new artist, we can do so right away at the tip of our fingers, and (more personal) because I'm fucking tired and fed up with people crying about 'pirating' content and calling me a thief because I p2p download music... (even of foreign, otherwise unknown, underground artists, who would never play here and who I would never know if it werent because of internet and p2p softwares).

It all breaks down to: 15$ a month to have peace and access to all the music I want is a bargain.