Because people keep buying it.
Y'know, Computer Gaming World is running a series of articles about the darker side of MMORPGs. This month's is on "farming." These folks get organized and have people in sweatshops in India, etc. play the game 24/7 and accumulate loot, which they then launder and eventually sell for real money. WoW, EQ, all the MMORPGs have people like this.
One of these guys in the US, when he finds out about an exploit like a dupe bug, will take off work and he and his sweatshops will take full advantage of it until it gets fixed.
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 XMEN member Card-carrying DTM OKL Fish-napper Though a program be but three lines long, someday it will have to be maintained. -The Tao of Programming
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