That's correct, the owner of the community should first pay from his pocket before his communty ca earn via advertising. Paid to post site needs a big invesment.Maybe the best time to monetize the forum is when there is a hundred members who are active and who are posting sensible contents. However, that is one problem if the forum is a PTP because the owner has to put up capital to pay the initial members in the build up of contents. That is why owning a forum is a big gamble because you spend at first without knowing if the site can earn from the ads.