Because by downloading it he adds one more vote to why the warez site handler should stay in business and probably makes him some money via banners.
Plus if you have to go through some of the sites voting mechanisms you help him that way.
Any download is a vote to the legitimacy of warez.
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Sarge is coming...
Richard Arnesen
Director of Covert Ops
Shrapnel Games
http://www.shrapnelgames.com