Passing this link from EQ Forum:
http://eqforums.station.sony.com/eq/board/message?board.id=Veterans&message.id=209546&view=by_date_ascending&page=1
Screenshow of why the default UI makes it easy for scammer or lazy buyer to cheat and shortchange you and how to make sure you get what you expected when selling things to buyer in barter section.
Pass this around, the more people that knows about this, the less viction would feed the scammer and eventually drive scammer out of business.