I would suggest trying other ad networks out as well. I used admob briefly and too had very low CPM I also hated that there support was so hard to get a hold of. I am currently using Airpush which has been getting me pretty satisfactory CPM and fill rates. I’ve also heard good things about Appbrain. I would suggest giving those two a try.
As I posted here, I was using Admob banner ads for a while but switched to Millenial Media and am getting better results. I recommend trying them. For interstitials, I use Airpush SmartWall and I also use Airpush push notification ads.
Hello fanarin,
Have you tried our services at Tapit?
We offer traditional Banners, Medium and Full Screen Interstitials, and AdPrompts–a type of Alert Ad that looks very native to OS.
What makes us a “good ad-network” is around the clock support with actual people, an SDK that is easy to work with, a very fast server, and large brand advertisers.
We have high fill rates in US, UK, Germany, France, and other tier 1 countries.
We offer consistent eCPMs and payouts. Feel free to sign up at tapit.com and give us try