There are some specific keyword for adsence which do pay highest CPC rate due to competition among products or services. Although these highest paying Google AdSense Keywords pay highest CPC rate as compared to all other Google adsence keywords that doesn't mean all ads which fits on same Keywords will Generate High CPC rate.

Its all about Advertiser investment and there Bid rate for particular keywords , Sometime even a keywords which pay low CPC rate can generate exceptional high CPC rate while sometime a highest paying keyword could not generate even 0.2$ per click. However there are some specific keyword in Google adsence which do generate some outstanding CPC rate which may range from 0.30 cent to 179.01$ CPC + depending upon there advertiser investment ,Bid rate and CPC rate .

You might we wondering why any advertiser pay's high CPC rate for advertisement . Answer is Bit complected as there are lots of factor that decides advertisement CPC rate . In simple words ,some factor that force advertiser to increase there CPC rate are Demands,Advertising competition,Bid rate,Keywords advertisement rate with high bid rate that Generate high Revenue by the advertiser , when any customer Directly opt in to there service or buy costly product online