How is payment decided?

Is payment to us for every click decided on a percentage level (of the actualy cost of the ad) or is fixed for everybody?
For ex. If a click on a particular keyword on adwords is for 3 dollars, do we get a perecent of it or a fixed amount?

Any info would be greately appreciated.

Definitely a percentage level because there some clicks are worth 10 cents and others $10. What we don't know (and Google aren't saying) is what that percentage is but some people out there are saying it's around 50-60% after analysing all their stats.

Gringo.

I agree that they are giving us a nice cut.. it is 50% to 60% at least. I am happy with how this works.

so its best to place law ads.....which cost about $50 per click..well ofcourse its only possible if you have a law site..but we can always make one and rank it high on serp's..

Indeed, and I'm sure many people are out there now designing sites specifically with AdSense in mind. I myself have thought of it ... at least it's a good way of getting people to write content

Gringo.