well its locked now, it may have been ok to start with, but has quickly turned into a "slagging match" between certain members, if someone with only one post is selling an item, and you dont trust them, a simple way is DONT ASK TO BUY IT,
why should anyone send an item to an address for a member, before getting paid, irrelivent of how many posts are made, simple use paypal/e bay, ask the member to put it on a "buy it now post" and then do just that, that way, your covered by e bay, and it'll only cost you a little commission, rather than you expecting it to be sent out before payment, and th