The Asian gold farmers used to buy accounts to replace the ones that get banned. They've shifted to very aggressively hacking accounts and using them to farm gold instead. The number of hacked accounts is significantly on the rise.
This just happened to a friend/guildie the other week... Noticed him logged in, and later in the day, checked and found that he was raping the guild bank.. Kicked him, reported it, contacted the acct. owner...
Funny stuff is, he had a 200-250 or so miner on the acct, that the hacker lvl'd to 450 and started farming with...
The acct was renewed, and an authenticator added to it, but it still took only a few hours to get it shut down, and I think the owner got a few weeks game time out of it : )
-Alamar