My research shows the developer receives 70% from Google Play and 70% from the AppStore. Maybe you're referring to the fact that Google doesn't take a percentage, but either way the developer receives the same amount.
http://en.wikipedia.org/wiki/Google_Play
http://en.wikipedia.org/wiki/App_Store_(iOS)
From what I've read, the reason developers lean towards an advertising model on Android, giving their product away for free, is because of two factors:
- People are less likely to pay for apps on Android
- Piracy is a huge issue. If you're revenue is based on advertising, and make the app free, piracy isn't a factor.
Unfortunately, there have been many studies that show ads in apps dramatically reduce your battery life.
Without ads, Android apps could be more than twice as*power-efficient
It's a trade off, do you want to pay 99cents, or do you want better battery life? In any case, developers have spoken out on how bad the revenue streams are on their Android apps. One developer recently said:
Another said:
One game developer for a small studio had 80% of their resources supporting maintenance, porting, and compatibility checks within the Android eco-system and only got 20% of their gross revenue from Android.
That's 4 times the effort, 1/4th the money. One quote I read was, "At some point, a game studio will simply drop the platform that is costing 16 times more to support."
Finally, one source said:
I'm not sure if that is still accurate, as it was from late last year, but I couldn't find anything newer.
Please don't kill the messenger here, I'm simply stating facts from various sources I've found.