I am registered at Google Adsense, and CPM varies greatly, depending on the amount of clicks and views of the advertisement. If there are four advertisements showing, and there is one user that clicks all four; it only counts as one click. The same goes if a user clicks the same ad multiple times, it only counts as one per twenty-hour hours. When I had adsense displayed on my website, my average CPM was around six or seven dollars, and at its best I was at thirteen dollars CPM. The CPM differs, like I said earlier, on your clicks versus views.
I hope I've answered all of your questions, if you have more to ask, go ahead and do so
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