I run a forum which is online for more than 5 years, it has a PR of 5 and receives about 40.000 unique visitors, 75.000 visits and 700.000 page views every month.
So far I didn't try to exploit its full potential and I have just 1 small block of 2 google text ads on it, which make just $300 per month.
I am not really interested to sell the site, neither I want to add more ads on it at this point. I am just curious to know what it worths. Any way I can estimate this?