I have only just been made aware of these kind of forums, where members earn points every time they post. They then convert these points into cash. Is this something that could be a money earner for both the forum owner and its members, or is it a bit of a waste of time? Also do these kind of forums allow AdSense ads? I haven't seen one of these forums displaying AdSense.
There are lot of such site but beware that some of it is scam. You can try payperpostforum. For putting adsense code at forum,you can try DigitalPoint.
In the last couple of years I've been paid to post in several forums. What I've found it is that these "paid-to-post" forums, where everyone gets paid to posts, have low rates and are very risky. A lot of them closes down and take their databases to other forums without paying their members. The only "paid to post in forums" I'm doing now, are for people here at DP. I do this rather than maybe being scammed in a paid-to-post forum, because people here are way more reliable .
yes either they just go away, or they make it almost impossible for you to actually make money from them
Normally they earn from PPC, affiliate or sponsor. Some of them use adsense since paid to post forum not against the adsense TOS