Final Fantasy XIV lately. You can't walk into a major city without seeing several dozen people shouting repeatedly about selling in-game currency, which has resulted in a lot of people getting to really kick their blacklists into overtime. But Square-Enix isn't ignoring the problem, and as of today we've been informed that a lot of players are out of the game for cheating. If you can really call them "players."
6,154 accounts have been removed from the game for advertising RMT services, while another 156 have been removed for "illicit activity." The game has also undergone a bit of maintenance to help eliminate the (unspecified) methods of item use that contributed to the problem. Whether or not this will eliminate the shouting spam that plagues the major cities remains to be seen, but it's certainly worth hoping, and it's always good to see the RMT crowd get what's coming to them.
[Thanks to Scott for the tip!]