I disagree with the idea of RMT being a negative in SotA, or any game for that matter. A game that has a strong RMT market shows the true strength of that game in that players enjoy it so much that they are willing spend extra money on it. It is when there is no demand at all for RMT that a game should truly be worried.
RMT can and will never be stopped. Sure you can ban game accounts, but the cost of bannings will never be remotely close amount of profit made by a seller. It is simply the price of doing business.
On the flip side, it is also best a game company never get involved in the RMT market. As a player, I never want to feel like the game is being designed to create artificial demand for a in game item that I must buy from a game company. D3 is a great example of this. Just make a great game and let the players decide amongst themselves what is of value.