Unlucky, the way I understood that is that they are putting a trade in for say... offer 10gc, receive 400 bread and get all of the trade offers in their in box. They leave them sit in the in box. After the 10 min expire they they add a new trade of offer 400 bread, receive 15 gc. Then after they get offers for the new trade they accept the old trade first, then accept the new trade. This way they were more or less working as a broker and they never actually created the goods.
Genious! lol, I never would have thought of it.