Just as a point of reference from the iOS world. My free apps have < 80K downloads total but last month I generated 4K from ads. You really can't beat the eCPMs

Just as a point of reference from the iOS world. My free apps have < 80K downloads total but last month I generated 4K from ads. You really can't beat the eCPMs from iAds. Android is a great platform, but the app market really is miles behind iOS. Rampant piracy, poor app market organization, and difficulty for most users to purchase paid apps means that if you want to actually make a living developing apps, iOS should still be far and away the #1 choice imo.