High Impressions,High Ctr,low earnings,why?

I am using admob banner(Does any one know of a better banner ad network ?which pays better?)
Most of the impressions are from USA

Here are the stats.

Please let me know what I am doing wrong?

Hey @rixxx22 try to combine admob with other formats to boost your revenue. At Pollfish most of our developers use us this way. We have 100% fill rate in the US for the moment.

Please don’t advertise here,