this is probably a huge ask but it works very well on avforums, could there be a system for tracking/feedback of buy & selling on the forum? i used to run couple of phpbb boards so i know adding custom stuff is a pain come upgrade time but its a thought
on avforums you have to put a link to the thred of your trade, all dealing must be done in thred not pm, and both buyer and seller give feedback and a trader rating is shown by your avatar.
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