Both Apple and Google now take 15% commission.
I am not a fan of neither companies, plus I am an app developer for both. I don't have a problem with the 15% fee from Apple as it's quite fair for the services and human interaction they provide. Though a case can be made that the $135 CAD developer license fee per year should take care of that. Google on the other hand will ban your app for strange reasons (look at the recent DroidScript app debacle) and won't even let you talk to a human unless you are big enough to get some tech sites to write about it. On the other hand Google at least allowed side loading apps something which Apple doesn't let you do easily. But then Google doesn't allow competitive app stores on their play store which is a problem. I think overall, both companies need to be reigned in but in my opinion, going after the 15% is not the right way.
Edit: Why the downvotes?