It doesn't prove anything.

Here's another interpretation: iOS devices are more expensive hence people that use them can spend more money on apps.

There is no need for interpretations. This is a fact that developers and publishers generally make more money on iOS.

I agree, which only solidifies the argument that it's naive to think a company in the mobile space can ignore iOS.

It’s just as naive to think that a company shouldn’t have to pay anything or play by the rules of such a valuable ecosystem.