My roommate plays the auction house.
On any given day, his mailbox will be full, several times over.
Anything that does not sell, is gathered again and then listed (bulk) via Appraiser (auctioneer).
He mentioned... I thought I just listed these a while ago.
And we checked, they were not listing but going to the mail.
According to MoneyFu, he spent 250g in auction fees.
And the GM reimbursed 25g.
So 10% not 100%