Don't underestimate the value of having hundreds of millions of users using their apps and services for data collection/profiling purposes. Then there are the

Don't underestimate the value of having hundreds of millions of users using their apps and services for data collection/profiling purposes. Then there are the ads. And the constant nag screens/dialogs pushing their various paid services. I suspect they'd be doing just fine without the store revenue. It's not like they got into the mobile business to collect fees from running an app store. That's just a nice bonus for them that's also been quite profitable.