Guy 1: "Giving all my stuff away, follow!" Guy 2: "OMG He's Legit!" (Both players are in on this scam.) Get enough people together, with clan waiting at Ice Plateau and guess what happens.
Any more I think Jagex is just letting these scammers run wild so they will have a justified reason to remove free trade again. "Sorry players, but the scammers forced us to do it."
