What concerned me about RMT is, after I read it in-game chat, that players selling items to players who got their Gil through RMT, will get you involved in the RMT chain resulting your account being affected. I really don't know if this is true or not, but it is making me refrain from selling anything. I know people could use this method to transfer RMT'd Gil to another character and getting away with it, but affecting a large population because of this, doesn't seem a good option to me.