Heh, we'll probably see more of this kind of thing in the future:
http://kotaku.com/e-sports-league-mi...mput-486205191
ESEA League, one of the largest PC gaming leagues, has admitted to putting code into the league's client software to "mine" bitcoins, the open-source Internet currency now exchanging for around $130 per. The league is offering free memberships as some members complain the code damaged their video cards.
One user said his card "maintained 90celcius+ for an extended amount of time," and he's getting video errors. He accuses ESEA of frying his video card. But another, in the same thread, said his "560tl 448core was running 93 C for who knows how long," but that it "seems fine for now."