Quote Originally Posted by 'Fursphere',index.php?page=Thread&postID=219713#po st219713
Players HAVE been outright banned for doing this in the past. Controlling the AH is a bad idea if somebody notices and reports you.
The only instance of this I've heard of is in conjunction with an RMT firm that was manipulating the market on several servers to both make a killing in-game and drive up the prices to encourage gold buying. AH domination by itself has not gotten anyone I've known into trouble.