A User would Pay To post a topic.

[Bleys]

I don't see any problem in selling software you pay to have made... why would anyone expect you to give away for free what you paid to have made? That's just silly.

I'd pay $15 (that would be getting off cheap) for this mod.

Even better, a mod that had a "credits" type system so that users could buy credits and then spend them to post in different forums (that way you could have multiple classifieds-type sections, some costing more than others--i.e., listing big ticket items might cost more than smaller ones--and not have to lock people into specific forums).