I do not think so The Site owners can any day without notice stop being there. These days I notice the pay one gets for working on such forums is decreasing by the dayI guess a paid-to-post forum can be considered a real job or business model. However, its success depends on various factors such as the quality of contents being posted, user engagements, and the forum ability to attract advertisers and sponsors.
Monetizing through paid memberships, advertisements, or partnerships can make it a viable business, but it must provide value to it's users to ensure sustainability of the forum.