Hi Xamarin Forums,
My name is Nick and I am part of the publisher solutions team at Airpush. We are one of the largest Android only mobile ad networks. We just released a new free Xamarin platform plugin. Our display advertising solutions have solid CPMs and fill rates world wide, and we are also able to pay our developers weekly (earning $300 or more a week). We also just released a new SDK that has a pay per install ad type, where you can earn up to $0.04 per USA install, in addition to display advertising revenue. Give us a try!
http://manage.airpush.com/docs/index.php?title=Plugins_for_Airpush_Android_SDK
LMK if you have any questions, or just want to chat.
Cheers! Airpush Nick