Your stats are correct when viewed in total dollars earned per app. But the life cycle of a iOS app is much shorter than an android version. In short, iOS users “get bored” much quicker than Android users.
The monetization over the lifetime of an app aka the LifeTime Value (LTV) is much more stable on android. Android generally sees lower initial installs but maintains those numbers for much longer. On iOS you get the early adopters but early adopters also means people the bulk of the people probably downloaded it because it is “new” so you get a big spike at release that doesn’t last very long.
iOS devs need to continually create new apps where as android doesn’t have the “churn and burn” that iOS has.
Different stats are at play here. Were both right, and I understand why iOS is a valuable place to develop, just depends if you want a quick buck or sustainable revenue.
This also plays only to small developers the big companies like Rovio for instance are OS agnostic really. They just make money plain and simple lol.
I like iOS dont get me wrong. But my company has tripled revenue by focusing on Android Development.