I want to charge people a fee to post in my forum. They would ask a question. People would then post possible answers and if one of them was correct, the question asker would check an "answer accepted" box and half their fee would go the member who was accepted, and half would go to me. Their question would then be listed as solved, and only the asker and admins would be allowed to view it from then on. It would then be deleted 30 days after being accepted.
So when they "ask a question" they would navigate to the appropriate forum and pay to ask a question. That would then open a category for the question, and replies would be entered into that category by members of the forum. Membership would be free, but questions would be a set fee (that I could customize as needed).