There is one guy on Sargeras realm and maybe on other realms who ninjaing cheap items on neutral auction houses in Dalaran, Booty Bay etc. He has several characters ( ALLEY, SASSEY, SESSEE ... ) and probably using some kind of auction addons or maybe bots. So if you want e.g. to transfer some item from horde to alliance and you put some low price He automatically buys that item and it's ridiculous how fast. It's impossible that he's standing all time there and watching what's on AH. This is maybe I don't know legal tho just want to warn you guys to know what are you doing if you want to transfer your items via AH.
perfectly legal o.o just a **** move of him, but it's your risk for using the neutral AH as a transfer anyways. My gf and I have made some good profit interrupting transfers :D
Unless you have conclusive evidence that a player is using illegal software or exploits to gain an unfair advantage in-game, please refrain from pointing fingers. If you do have evidence please send it to a GM for further investigation.