The problem with any trades in game, whether auction or face to face, is that it invites RMT which plague these games. It has plagued POE1 for years. With offline Auction house its going to be worse. Also with an offline AH you bet your ass markets will be controlled by the few. So again, they can profit from RMT. Players like you or I, no matter how hardcore, cannot compete with armies of China man running amok.