The member you are refering to is a subscriber and as such can post classifieds. AFAIK there are no restrictions to the number of posts that a subscriber must have to be able to post classifieds. I am not saying this is good or bad - just stating the rules as I know them.
BTW, this member joined on 03-27-2006 as per the profile page.
Edit: I think this thread would be better suited to "Feedback and Discussion" rather than "Ethics and Philosophy". My $0.02.