CPC depend on the content of the site for examle wallpapers site have low cpc and hd wallpapers have high cpc and a mobile phone related site is higher cpc then a wallpapers site and a site that is related with automobiles have higher cpc then mobile phones so i think the content is base of the cpc.
bu t i see some blogs get high through rate & some say its is clcik bombing 7 it depends on page views on your site thats the problem how i know that my ctr in normall way when my visitors and page views high how realize that if am not saty on my blog 1 or 2 days ???????? ~_______~