Do you want Timed or Blind Bidding?
If not then you yourself do not want an auction house. You want the benefits that one gives you through illusion. None of the benefits of an auction house are exclusive to the auction house itself. Only Bidding on items in a Blind or Time Delayed System.
The Only reason the WoW AH is called an AH is because it has timed bidding. If it was just a "post the final price and sell" type system they would have probably called it a Player Market or something. Which is exactly what SE did, SE just hasn't finished adding those same illusionary conveniences.
And if you did want Blind and Timed Bidding, your an idiot who wants RMT's to own the marketplace.
I agree. But if there is the items that are sold to it need to have a special designation so you can't sell chaff and brittle on it. IE. Something like what I designed in my Gob Shop idea where you can sell Unique/Untradable items to the "Auction House" then they are recycled turned into new items and exchanged out to people buying them in "Gamble Bags" A bag that when you open it you get a random item from the inventory of the system. This prevents RMT's from being able to corner the market on special items and if you use an Endgame token system to use it then you can limit the amount of RMT influence on it over all.