If the fileservers had advertising or fees I could see a "profit" but where is the profit being made "trading" files?
I'm an outside observer in all of this (I don't download tracks).
The guy selling mixtapes at the corner store is making a profit but for 20 years, the industry has generally turned a blind eye to that practice too.
Certainly the industry accepted the practice of making a mix tape and GIVING it to a friend. Taping off the radio wasn't a crime either.
The industry eventually got a tax levied on blank cassettes (even though there is no justification of which artists to share that revenue with).
They got that same tax levied into blank CD's ... now I just carry a portable 20GB hard drive that process mp3's and playlists .....
Pi$$ on RIAA