Agreed, this is a growing problem. Like said before, we've all been scammed. For instance, this one guy was trading me a rune long (bank note). First time round, he cancels the trade. Then he asks me to trade again, and this time he puts up an iron long (bank note) which looks exactly the same as rune long in bank note form, and shazam, I get scammed. Make sure you always double check what you are trading for.... Also, what can we as players do to help this problem?