Totally unrealistic if you ask me. I tend to use these sort of sites as a preview service. I'll download a track listen to it and if I like it buy the album, if I don't I won't, from my perspective its only increased the music I buy. Would book publishers prosecute people for reading sections of a book in a book store. If they feel they want to prosecute me I'd be happy to go to court and defend myself. The way I see it is that there are 2 main groups in this, those who download with the intention of copying and selling the material and those who just do it to listen to it. For years people have had access to the radio and cassette tapes, buying a record is a bit more than just paying to listen to something, its showing your gratitued to the artist, a statment saying "this is worth paying money for"