What we have done is setup a system so the ad revenue can be shared between all active members of this forum.
This forum displays one advertisement in the upper right area as well is inline when viewing a thread. We use Google AdSense to automatically serve relevant ads for the content on the page. Google pays AdSense publishers on a per click basis as well as per impression.
If a user has an AdSense account, they have the ability to credit their account with the ads served on threads they start or participate in.
If you have any questions about it, please visit this thread
To obtain an adsense account follow the link below: