Good luck to 'em, but they're fighting a losing battle bless their little cotton socks.
You cannot stop P2P filesharing unless you completely re-engineer the internet, and make totalitarian internet-wide DRM the de facto standard.
That isn't going to happen anytime soon, despite the best efforts of the money hungry cretins running America.
... and nor should it, since P2P has perfectly legal applications too. Many software companies distribute larger applications / ISO images over BitTorrent now, it's the only way to do it without caining your bandwidth.
VCRs did not kill the movie industry, home taping didn't kill music.
On a related note, buy your tunes if you're playing out. I couldn't care less for mixsets, but what kind of nobber downloads GB and GB of unmixed tunes just to listen to? The scene thrives on mixes, and there are literally millions of the buggers freely available. Just ask Conflict.