Let me suggest that as one of the "privileged", by dint of having run my mouth with some frequency (if not productively, just frequently
), I have become more and more active in sending Post Reports over time, rather than less active.
Those who have been around for a while, and enjoyed learning and posting on MR, are more likely, IMO, rather than less, to want the Forum to a pleasant, interesting, and civil place to spend time.
Since I cannot back up my opinion with any facts about who are the most likely to help the Moderation team in their difficult task...take my observation for what it is worth.
As far as the Marketplace Rules go...it is my understanding that the idea is to require those posting there to have demonstrated some ongoing interest and commitment, if you will, to the Forum. Do scams occur? I'm sure that they do, on occasion. But the restrictions placed on Marketplace participation are an attempt to ensure, as much as is reasonably possible, that what transpires on that sub forum is honest and aboveboard.
I hope that my disagreement with your position has not given offense...none was intended.