Money laundering. And probably a few various methods of abuse of the trade system.
Define "abuse". There are ways to get around the no loss limitation, but it makes sense that it is there to being with. I see a trade offer from another realm at 40 and a region in my own realm with a buy order of 25 who will need the food, who cares if I take the loss? It helps my realm (or my aims) so be it.
