I own http://www.slackwarehelp.org and I am hoping to sell text links to support its growth. I will place these text links on the footer of every page. I have not decided on a price yet, but I will consider all offers.
The forum is well over 1000 pages and has about 750 articles. It is indexed very well by google and is #1 for many searches. I never paid anyone to post or anything like that. Just about all my visits come from revisits or google.
The site got hacked once and I found people where using google to find phpbb sites. The code on the bottom is what they where looking for, so for secuirty reasons i removed it all. Now that it is removed, patched and a few other custom things i have done it is safe.