Maybe add a way for the thread starter to set a thread to "sold" and have to enter the buyers username. Then make it so the transaction thread is required, and feedback can only be left between the person who started the thread and the person who the thread author sets as the buyer. Wouldn't be too hard to do, and would fix a lot of potential problems.
Although I think in most communities people would respect the rules. There are always a few stinkers though.
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