I run a website that gets about 8000 to 9000 unique visitors per month. Last year I had 130,000 visits to my site. The site is on a fairly high value topic in an extremely specialty field. I am currently on the first page of google's results and haven't budged from that position for two years.
I run Adsense ads on the site. I make about $300 per month from Adsense. In addition I have sold several image ads for $1500 per year.
I have two friends who run companies which run ads which regularly appear on my site. Both told me that the average rate they pay for a click with Adwords is $2 per visit. One usually is listed 3rd on my adwords, and the other much lower.
Since I get 130,000 visits per year, and since they pay $2 per visit, that makes the value of my traffic $260,000 per year.
130,000 (vists per year) x $2 (amount paid for visits) = $260,000 (value of my traffic)
Last year between adsense and advertising, I made about $6000. I think I should be earning much more.
What would people suggest?
I've been thinking about selling the URL to a company that is advertising in my space. This would probably bring them over 100,000 visits per year, and could be worth about $100k. Is this reasonable?
Thanks so much everyone!

Have you considered affiliate programs? For a site with your traffic it may pay of big times! Especially when you are in a specific topic field... Please feel free to mess you URL to me!