I am thinking of selling a two year old website which earns about 800 dollars a month (all Adsense). The site has a very well brandable .com domainname of six characters. The name is not a dictionary word but is easy to remember. (Think about something like Google or Flickr) All content is uniquely written by us over the last two years. Normal traffic is about 2000 unique visitors a day but the site has large spikes in visitor numbers to about 20,000 unique visitors a day. Most visitors come from search engines and most of them come from Google. Rankings have been pretty stable over the site's existence. As there is an interested party I would appreciate an estimate of the site's worth (sorry I cannot give the specific site right now). I understand it is difficult without giving the specifics but I would also appreciate a price range indication or other helpful comments.
There are various ways to value a site, but the most common is about 8 - 12X monthly net (after all expenses). It also depends on how much time a site takes to maintain - i.e. if it is 3 hours a day, you would be buying yourself a $9 an hour job for $800 a month. A site with stable and increasing earnings is obviously also better. Sites are usually valued according to actual results, not future "potential" - as every site has "potential".