the original poster of this thread had the “spider senses” mentioned …
I must say (imho) trust your senses (spider, bat, Betazoids …)
in general, the idea of a minimum count of posts was welcomed, except for some users who are regulars and never post … well -shrug- …
another thing that popped into my head was:
how bout we offer all prospective buyers (and sellers) - HELP -
(hence we would act as a 3rd party MAYBE hold the money escrow till unit is shipped and arrived, or we want to see proof of ID, recommend having a phone number supplied, double check pictures of units with daily newspaper and / or serial number)