you can't commit
a crime (according to the MPAA/RIAA ONLY) to prove a crime. i think The Pirate Bay is actually used as a research/marketing engine. you cannot know if your movie/game is popular just by sale only. Plus, event when pIracy "hurt" you (crisys), if the product is good, i can bet that a lot of peoples who "used alternate distribution chnels" to get Crysis 1, have paid for Crysis 2 and even more poeples will pay for Cysis 3.
Piracy is actually more effective then a demo. As for movies.... well, if it's a flop, you glad your torrent it, if it's not, it;s worth the purchase of the Bluray. Beside, with 2 billions+ in profit, do you think piracy drive down the sale of Avatar?
If i say the Pirate Bay is controlled by the MPAA/RIAA, i whould not be far from the true. That is why it is still up. it is a extremly valuable marketing tool.
PS: a chunk of garble date is no prove of sharing. if they want to nail you for seeding, they need to get the whole thing from your IP.