AFAIK, there is no native way in vB for limiting the posts of a usergroup, in a certain forum, to a certain number per month.
I think your best bet would be to open up a forum that is only visible to subscribers, where they could post their thread. Upon approval, you could move the thread to the public classifieds section.
If you wanted something cleaner, I think it would have to be custom code.
-Nick, SEOvB Developer (btw, we do custom code)
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