I think the auction house needs a bit of an upgrade to make it more like an auction. The Auction House is more like a place to go and sell items. Not an actual auction. It would be fun to implement an actual silent auction where players can auction their items to the highest bidder. Maybe include a starting bid and a time frame. For example, if I put a Stardust Pickaxe in the silent auction, I could set the starting bid at 100M and say I want it to run for 4 days. Maybe put a weekly limit to the number of items you are allowed to buy.