The major problem with the GoldSellers are not the spamming really. People have to understand how GoldSellers works. They first have to have the in game gold to sell for cash. Where do you think they get the in game gold from ? Playing the game/grinding the game or hacking to another person account and transfer the gold. How many person are "employed" to grind? How many character are made for grinding ? Multi-box (notice this game haven even solve this simple thing. Too greedy maybe). You do know that the are going to flood the market with mats/gears and gold right ? Resulting a broken market if it goes big.
