Post count question


Ive got an issue with my For Sale forums and need to impose a post count limit to be able to sell. Up until now, I havent exempted the FS forums so all the posts people have made in the past are still there. If I disable that forum from posts counting, will XF recalculate user count post or am I stuck with the post count being what it is?

I have a lot of people that only come to sell stuff in the market. I need to be able to weed those people out but Ive got to knock their post count down to get a true idea of what I need to set my limit to.