It might be time to update the trade house altogether:
I think the VIP tables should be removed. They are barely used, and most people are to the left of the main room at all times.
I also think with the auction idea, the trade house should be limited to two rooms -- an auction room and the normal "buy it now" room.
Upon entering the trade house front door, you go into a small lobby that's just small enough to display both doors on the left and right with the signs, auction and trade, on all screen sizes as to not discriminate one room or the other. I suppose the auction would only allow the trade of ZC, or do you guys think it would be cool to be able to choose from a search bar which item unit to auction it for? Yeah, that would be pretty complicated. Maybe just ZC.