Good point, if you don't want to purchase from someone that hasn't posted 500 or more times, then don't.
Another thing, say Ralph Davis, or another reptuable breeder, joins the site and wants to post some snakes for sale. Should we be like, "Sorry Ralph, you have to post 500 times."
Most of the people that post snakes for sale are honest people. I don't think there should be a limit for a few bad apples.