The only real way to get rid of RMT is to get rid of the players that buy gil. But since that will never happen, RMT will continue to stockpile, spam, and sell their gil. I don't blame the people selling the gil, I blame the ones that buy it. They're the ones that enable the sellers, by making it worth their while. The RMT wouldn't be so rabid in this game if they didn't have so many buyers.