The scenario is unlikely , but if you cause enough mayhem on the auction house to piss off a significant portion of the player base , Blizzard will intervene , they always do . They don ' t unless you break the ToS . It pisses me off to no end when players undercut and relist . It pisses a lot of players off and even forces them out of that market . Yet Blizzard never intervenes . Selling stuff on the AH and buying stuff on the AH is not and never was by itself a violation of the ToS . PvP is allowed , but when one guild was griefing another guild at Garn , a GM intervened and stopped them . That is NOT what happened . At least not what he was punished for . He was punished for exploiting the mob from what I have read abusing a fishing raft to kite it and not for engaging in PvP with someone . Which perfectly makes sense since Guilds on PvP realms used to constantly fight each other over world bosses . Yet this single instance gained huge momentum solely for the reason that PvP alone never was and never will be the reason for a ban .