Not to talk against you plush, you help out alot in the Theft forum, but...
Pb Nation offers the B/S/T as a service here. They do not require that anyone that registers use the B/S/T ever. Much less on any kind of regular basis. They do state, in their own words, the buyer should beware and should arrange for contact info with the seller, or trader. It's in plain black and while, or whatever colors that you choose to use. Threads like this, whereas they have a great intention, are in a position that they just don't help. My reasoning is that since it is not a requirement to use the B/S/T, and Pb Nation has taken steps to minimize, or eliminate scamming and bad transactions, ultimately, it is the individual users responsibility to read those steps, and to follow them.
Someone, I think it was DarkarmorPB, said that if you can't afford to lose whatever you are selling/trading, then you should not be doing the deal in the first place. Granted, I don't want to lose anything, much less have it stolen. But, I know that it can happen, and I have followed the rules that Pb Nation staff have taken the time to formulate, post, revise, and add to, all so I can have a more positive experiance whenever I buy, sell, or trade. It's really as simple as people reading what the Mods have posted up, and literally following them.