Figures the person with a valid point about how much Google has paid out gets thumbed down by the idiots. Google has reported payouts in the past and they are waaaay behind Apple. So far behind its embarrassing.
To the person taking total Apps and divided it into money paid, your calculations are pointless.
There are a huge number of free Apps where developers don't need to make money. My bank has an App for online banking. My university has an App. My hockey, football and basketball teams have Apps. Even my local butcher has an App. All free and provided as a SERVICE, not a way to make money for the developer.
These days an App is like having a web page.
Oh, and I see no mention of developers choice. iOS is still preferred by developers more than 2:1 vs Android. Developers know where the money is.