Until I can get the directory installed and running lets post the sites you've owned or were a member of staff. I myself have owned many and was staff on many more.
Here are the big boards I owned, sold or closed.
Extreme Visual Basic - This used to be at a different URL which the new owner failed to renew. I sold it to iNet Interactive at the height of it's popularity. When I sold it there was an aversage of 500 users online at any time and 2000 new posts a day. It was number 1 in it's niche.
What Pisses You Off? - This was a forum I started as an off shoot to a thread that was posted on my visual basic forum in the Random Thoughts forum. I never expected it to become as popular as it did. I sold it and the new owner immediately deleted it and closed it.
Just BS - I started this site after a few of the users of What Pisses You Off asked me to since WPYO closed. It was sold and I don't think the new owner ever re-opened it.
Computer Help Forums - I sold this site a couple years ago when I wanted to shift focus back to Free PC Help.
These are the sites I started from scratch and then turned over and sold. I have also bought a few sites.
Lets see your sites.