Sorry for the bump on an old ass thread. I opened a new thread re inmobi. Then i found this one after searching.
My strategy was different from this. The results were the same (overage like woah)
But then account got suspended. I got in contact with inmobi but was getting the run around. So opened a new acct.
Figured I'd messed something up with setting up budget so was more careful this time. Banned again after 2 days.