On WoW (I'm not a big fan of WoW) when you search for items on the AH you get to see each item individually, the person who is selling it, and get to buy the one you want. If SE did something like that for the AH on FFXI that might stop the RMT from trying to control the prices of popular high priced items. You can tell who a lot of RMT are just by their sales history (Buying everything out, selling to each other at low prices, then making sure the only ones up for sale at any given time are their own at the high prices they want). If you could see who you were buying something from, you could avoid buying from RMTs.