Well unless you have some good looking content on your website i doubt it will do any good SEO wise but those kind of things can never be predicted. If it has no PR nor backlinks i say its a good 20 bucks if that much.
Agree on the twenty bucks. If there was some content behind it or even a script installed and established, it would be worth more. Hmmm, I wonder if RateThatMilf.net is available....
I like the name but you need to make it into a site to be saleable, the days of registering domain names and selling them for massive profit is long gone