Probably my last suggestion for a while, but...
Since most people don't pay attention to Trade channel. Maybe a section for people to post their offers could be made into the Auction House.
Useful to:
People trying to make fast crowns and can't afford the selling fees.
People on a budget and not willing to spend more then a certain amount for something they want.
Also.. If some kind of stock market, as suggested but other people, was added it could help with buy/sell/trade guidelines as to what players think certain items are worth.
Basically we come up with some kind of point system based on Rarity/availability + Tier value . Player can search the "stock market" see what that item score is and set a reasonable price range.
R/A +(T) = ?? Then compare to a chart.
I guess what I'm saying is that since the players dictate the prices anyways. Why not help each other out with buying/selling/trading.
this is a very good idea, it makes senses to have regular rate of cost for each item. the only problem is i think this idea has been sugested before and it ran into a problem. im not entirely sure because im so tired. well if it hasnt, then great i hope it works out.