@ @SirusFPS
This has been suggested many times before and the answer is always the same from any of us...
Which is that not only would that restrict the marketplace, but it would serve absolutely no purpose as there have been scammer's of every post count(what you're stating also encourages people to just spam throughout the site to achieve the required post count of 150 lol).
Sorry, but in my opinion there will be far too little reward for the cost of a multitude of activity in the marketplace.
Though thanks for your suggestion as any suggestion that benefits MPGH is worth hearing out.