Let's say I generate $1 in revenue for AdWords by displaying an ad on my site that is clicked and the advertiser pays $1. Let's further assume Google gets 25 cents and I get 75 cents from that $1.
The next day I double that and generate $2 in revenue resulting in $1.50 for me and 50 cents for Google.
Are you saying that on the second day they decide I should still only make 75 cents and thus Google keeps the remaining $1.25?
Wouldn't it be in Google's best interest to keep me motivated and generating legitimate clicks since their income increases along with mine vs. me being discouraged and failing to work hard towards generating more clicks?