I kind of envy the people with enough expendable income to even consider buying gil in the first place, especially at the ridiculous rates they try to sell it at. There simply isn't enough to spend it on...but I honestly don't mind if it stays that way since it would just encourage even more botting and RMTing then there already is.
But in all seriousness, there isn't any way to realistically prevent RMTing entirely with how many sources their gil is coming from. Even if they could keep the hacking, mass-produced gil farmers in check, you also have both RMT bots and legitimate players earning gil through the MB and selling it off.
