iPhone is where the money is at, so developers develop for the platform that can feed them. Sure it sucks that you give 30% to Apple, but 70% of a significant chunk is better than even 100% of a small sliver.

Developers will follow the users, at least initially. Apple delivers the best overall experience for people who don't think of their phone as a computer.

When I get an Android phone next upgrade I'll still keep my iPhone for development.