Depends a lot of your site content. If you have a good niche maybe about 30-50cents per click average with peaks of $1.5 even more, if it´s a not so good niche it maybe even 1cent per click. Basically depends a lot on your site content.
Niche can be explained as the category of the site Different Niches : - Health - Affiliate - Body Building Hope that helps
Note that the value of a click on a particular website changes from day to day, and probably from impression to impression. One day a niche site might average $.10 a click, the next day $.02 a click and so on. The variation in price depends upon which keyword(s) Google responds to on your page as well as what advertisers are bidding on the keyword(s). There are most likely other price variables that Google uses that determine a click value as well. I have websites that will give me an $.80 click, then follow it with a bunch of low value clicks $.01 to $.XX during the day. Keyword value is always fluctuating. While you want to have some focus on the keywords in your content, put more focus on the uniqueness and quality of the content - this will get you more visitors and more clicks and more money over the long haul.