Webmasters conceive that some revenue can be gained on forums for numerous reasons. The principal reason people see a lot of revenue in it is because they've an large number of page views and return visitors. It's really hard for a normal internet site to get those two things and really easy for bulletin boards to get them. People center on that and hasten to commence a discussion forum just to abandon and let it die after a brief time period.
The reason is since a lot of people don't take into consideration how crucial actual signups are. Many people will attend a forum daily and scan through things but never sign up. If people don't sign up the bulletin boards are useless.Something that can be done to lure people to join is offer rewards for those that sign up.
You can in addition to have a posting competition by giving away something to the first person to achieve a certain amount of posts. A different thing is to start a contentious thread that will coerce people to join and take part in the discussions. Irrespective of what you decide to do to get people to join try and be sure that it's planned out before beginning the forum. If you toy with that after the forums have been initiated it might be too late.