In the interest of anonymity I would prefer not to reveal my real username.
I have a site that does about a 150,000 pageviews and 5,000 uniques a day. It is profitable, making about $50,000 a year, not from adverts. The average pageviews per visit is over 30.
At the current growth trend I would expect it to be making over $150,000 in a couple years. It is also an influential site for its niche, market leader in its own right.
It comes top of google for any keywords pertaining to the market it targets.
What do you think is a good price?
Asking for 2 years of income is a good general rule.
Also factor in growth rates over the next 2 years. Estimate growth based on past growth, not on "well I have this new feature that should double traffic.
Factor in any assets you may have, this includes but is not limited to: - Newsletter subscribers - RSS Subscribers - High search engine rankings - Good domain name - Industry leader
Think about the sentimental attachment. This is worth something, figure out your price.
Finally forget about the lump sum of money. Its sexy to think about a big pile of cash, but you have something in your hands that is making a consistent profit. Think in 2 years if you'll still be happy with this decision.
Take this advice from someone whose sold a website that has seen enormous growth since I sold it. Its amazing to see something you've made become huge, but also a little sad thinking it could still be yours.
Good luck, you're in a good position. A buyer approaching you means you have something they really want. Don't forget that!