More than simply banning people without X number of posts (as an aside, exactly what should X be? Some people post 50+ posts a day. Some people (like me) post about 1 post a day. I hope that most people recognize that quantity of posts does not necessarily equate to quality of posts.) is that I wish that you guys just report these people. Frankly, if their first few posts -- and only posts -- are in the classified section, I'd call that a commercial enterprise, and are not allowed by the rules. Or if someone is constantly selling, then that is also commercial, and not allowed by the rules.
Basically, we have a classified section for the convenience of our members. We don't make any money on it, and it is not policed like a commercial site. We aren't looking for traffic levels of a commercial site, either. We just wanted to provide a place for the occasional excess livestock or materials to be sold to fellow forum members and enthusiasts.
So please, if you see something suspicious in there, please just hit the report button and express your suspicions. We'd rather have some false alarms than let a lot of stuff go unattended to. All the admins and mods are volunteers with busy lives of our own, so I will admit that not all sections get read like they probably should, so we do appreciate it when people bring issues to our attention.