I was with the initial group of 50 crafters on my server (Cactuar) so I was pretty involved with what was going on around launch. When players began using RMT to purchase two star crafted gear for ridiculous amounts, the crafters who were profiting off of these players buying gil also got caught up in SEs crackdown on RMT, typically getting their gil divided by 100. Whether or not SE will do something like that again who knows, or even at what threshold of gil, but it's something which happened in the past and could potentially happen again.