Because to shut them down you have to attack your own customers. It is a segment of the players that drive the demand for buying gold/items in games. Blizzard, for instance, is well-known for their public dislike of RMT (real-money trades) in WoW. They could crack down a LOT harder than they are now, but what's the upside for them? They aren't really being hurt by RMT, and given that they have 6 million users, the players who are vocally against it apparently aren't hurting their business (most people I have talked to who are vocally against it continue to play WoW regardless). It costs money and lost subscription revenue to shut down RMT, without much upside for Blizzard. Thus, they occasionally make a big PR thing out of banning a few thousand accounts for gold farming, which are all, no doubt, re-opened under a new credit card the next week.
--matt
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