Most iPhone developers don't make money

Keep in mind that a good number of games are free, so that developers aren't trying to make money directly through selling the application. They are trying to build good will and brand awareness that can worth far more in the long run than direct sales. Building an iPhone App is becoming part of every savvy company's promotional arsenal and the idea isn't always to make money on the App itself, but to indirectly influence consumers. A game that's related to a movie release for instance, that puts the movie on top of mind for consumers is probably more valuable than the expensive commercial buys on television. It's not always about making money.

While the core of the matter is fine and well represented. But a survey is a mere statistic.
Going mobile is the future and iPhone presents a wonderful medium. If you're a business owner, you probably cannot ignore a market share owned by iphone. You would want to reach out and having an iphone app is the way forward.
I'm an iphone developer and trust me we have work, loads of work and its not at all domain specific. Money is'nt at all problem.

Very interesting and hardly surprising for several reasons:
1) Low barrier to enter the market.
2) Many developers are just learning, often giving away games to get exposure, feedback, etc.

What about the future? Many game developers, as individuals, will increase their development skill and learn the iPhone game business.

And we will people gather games into low-cost bundles; or create small cooperatives of developers. We may see big names like Disney, or Nikolodean join the market and hire developers.

Remember the iPhone is NOT a phone. It is a new platform that happens to handle voice calls. It is a PDA, an eBook, a media player, a game platform, and more.