My main account got banned with close to $20,000 worth of gold only a couple weeks ago so it is a small loss if put it into prospective. Just like kmjt said its apart of trying to make money on Runescape as much as it sucks to lose money sometimes it happens unfortunately. Being banned after trading x amount while another account hasen't been banned for trading a lesser amount just comes down to luck and when you decide to do business, 12am - 8am GMT seems like the best time frame for avoiding bans for rwt (they will still happen though).