So can a notice board tell you where to put something. You must atlesst make a list of trusted sellers
Well, it should be easy enough to categorize where people should post things, but occasionally people either don't know a section exists, theres some ambiguity in the subject matter, or they just don't care, and things are put out of place.
So heres my hypothetical for a list of trusted sellers:
Of course me!
anyone who secretly sends me a pm and a fee!
longtime trustworthy members to disguise those that pay me that fee
Two of those three categories are an issue. Moderators aren't screened for trustworthiness before they are made moderators. The only thing they need is to be understanding of the rules and some interpersonal skills. They should not be in charge of regulating business.
The best solution is for people to do their own due diligence and use escrow.