if you want earn money per page visit so you must get something like FastClick or if ur site is high quality its better to use casalamedia or etc ... don't use Google for CPM bro !
If you find $$ in your adsense account without any click, it is most probably due to cpm ads. On the contrary if you find clicks and no $$, it could be due to invalid clicks for which google credits no money. Hope the situation is clear now.
google has CPM ads automaticaly added to your account..sometimes publishers sees few cents on their account earnings..
Yeah, there is another thread going where someone earned a few cents, probably just for CPM earnings. It happens.