Do you earn revenue by CPM?

Hi

title is my question.
I wonder me how high the revenue is if you earn by CPM ( if you don’t know about CPM: https://support.google.com/admob/v2/answer/3436338?hl=en )

So if you do it would be glad to share some information. I saw here some people they have high impression values but less click. Just want to compare it with CPC.