Just because there's a ton, doesn't mean its saturated. Moreover, do the owners of those apps have the ability to direct 10k users daily towards downloading their app? I would seriously look into it. Same with Android. Its silly to dismiss the iphone just because there are competitors. You can kick their ass even though they were first.

Edit: I should also add, the iPhone/mobile apps would likely far outstrip the sales of the $15 download, because people are used to buying iPhone apps, and Apple has made it much easier than buying from you. I would even suggest reversing the flow, so to speak, and talk about how iPhone users can find a free version online from their home or work computers whenever they want.