i agree with wnaplay.
i have made thousands on there as well.. but also have had bad experiences.
its no different then a classified ad in the papaer.. your gonna atract all kinds on there.
take the good with the bad.. but the good experiences and the money made outweigh the bad by far.
as for the trading thing, yes there are some retarded trade offers.. but also some good ones...i have done some trading and come out well ahead on deals.. i dont generally keep what i get in trade, but i make more profit off it then what i would have on the item i was selling.