Suggestion A: Open an auction system
It’s not matters whether provided through an Auction house or an extra trading system.
Everyone can put stuffs in this system to auction. Auction system can take some certain commissions depends on the auction duration the auctioneer selected.

Suggestion B: Auto arrangement of adv in star
I see there is an auto arrangement in each column of star. But the auto arrangement of adv in the Misc did not work good. If u have over 3 or more pages of adv, u can see there is a mess. Suggest that you can improve that function and make the same adv auto sort together.