you can't do sweet FA unless you pay with paypal or credit card like previously suggested. imo and what i do if im buying off a forum is just research the person your buying off, read through previous posts and if they have a low post count make sure you call them to get and idea of what there like etc...
i've never had drama's buying anything from members on this forum all the regulars are pretty solid

i dont think there's any point to lists, if its a bad seller list they can just make a new account no worries. if there gonna rip ya there gonna rip ya, especially if there good liars which there are a few around