I just have something for you to add to your scam prevention part. I merchant alot with coal so i accept alot back when i sell the coal. Well one time when i was trying to sell 1k coal, some lvl 14 came and traded me, he offered 1444k, then alot of other junk, like 3 lobs, 2 un noted coal ore and pie pans and stuff, but he then went and took away 1 or 2 of the items. When i went into the second trade window i saw that instead of 1444k, it was now 1444gp. So i stoped the trade and walked away. But just to say ALWAYS CHEECK THE SECOND TRADE WINDOW IF YOU DONT WANT TO GET SCAMED!!!