Technically I guess they could consider it RMT, but SE created the situation themselves. The more stuff they add to the mog shop and the more money they charge (looking at you $30 mount) the more likely this stuff is going to happen. There rich people in RL and there rich people in game and just swap wealth in a different way. In the end Person A get the mog shop item they want, Person B get gil and SE get paid money. Like said earlier SE created this situation themselves and if they don't want it going on then they need to have a in game way to get the items in addition to just being able to buy it off the mog shop.