Quote Originally Posted by Nawesemo View Post
s.e. notices 100s of mllion moving to and from any given character, they should look into it, send a tell, inquire what is all that gils purpose, and make decisions from there
SE polices RMT with their own bots. My account was suspended because a large amount of gil was traded. I contacted SE over the phone and the agent I spoke with told me that it was an automatic ban. I can't be certain because I wasn't the one who traded it, but my guess is that it was exactly two weeks after the trade.

tl;dr
SE uses programs to monitor trades and bots to automatically ban people who are flagged for 'suspicious activity'. Lazy as hell I know, but not likely to change.