How to eliminate Real money gil sale spammers

[Zplinter]

A possible solution would be to instead of targeting the seller, target the receiver. Have a script in the background that scans a player wealth and compares it to the last scanned value and it there is a large change (in the millions) then a sub routine is invoked to check for market board sales. I the players retainers have no market sales to compare to the "sudden" wealth then the system locks the account pending SE review and or the player explain how they "magically" have such wealth.
Once players realize that buying gil targets them by the system the willingness to buy gil decreases, then the market for the gill sellers dries up and they move on to another easier to sell in game. Database scripting should not have that much overhead.