I quote from http://www.apple.com/iphone/from-the-app-store/ :
Over 500,000 apps.
For work, play, and everything in between.
The apps that come with your iPhone are just the beginning. Browse the App Store to find hundreds of thousands more. The more apps you download, the more you realize there’s almost no limit to what your iPhone can do.
There's no limit to what the iPhone can do because we don't even need to tell developers how to price their apps.
There are hordes of 20-somethings subsidised by VCs to extend our platform for free forever. No wait. They pay us 100 bucks a head for the privilege. Every year. And there are thousands others who follow suit, even without funding, because they have selectively read all the chapters of Steve's biography talking about the importance of beautiful typography and minimal furniture.
There's no limit to what the iPhone can do because we don't even need to tell developers how to price their apps.
I'm going to stop now. This is too painful to write about.