Well, this is most defently nothing new at all.
You just have a good friend on the other faction side. You put up the item at BO 1 copper, nod at your friend as a signal for him to buy it out. Item transfered without and loss.
Also, this is a good way to move "gold". You use up your gold on one side for things that will sell certainly on the other side for equal amount or more. Then transfer them via Gadget/booty AH. Resell on other side.
Hope it helps someone. (Has atleast helped me alot.)