Market system idea is bad, the entire thing should be run by players, the entire point of a market is to have something that is completely player based so that there is no "minimum" sell and buy rate, this would also push the amount of money to astronomical figures and people would never be able to obtain these items successfully. Mass money horders such as you and myself would corner the market and, well, a monopoly would quickly emerge leaving small partners out.
No, I am all for a near-perfect market situation where no one is able to launch a monopoly due to being able to pay more than the computer and thus hording all items.