Apple has made less than $45m in revenue from the app store
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Compare that to the $100m "iPhone Fund" that Kleiner Perkins announced in March 2008 (http://www.techcrunch.com/2008/03/06/kleiner-perkins-anounce...). This seemed like a lot at the time, eclipsing the $10m "fbFund" for Facebook Apps from Accel, which itself seemed big at the time (http://www.techcrunch.com/2007/09/17/facebook-launches-fbfun...).
While $100m and $50-112m seem like comparable numbers, the difference between investment and revenues is huge. Think about it, would you rather have $100m in VC money or $100m in revenues (per year!) from customers?
The biggest benefit to Apple is not the revenues they get from Apps. The biggest benefit is from the thriving community of iPhone app makers who are probably willing to spend on the order of $50-$112m of effort (per year!) improving Apple's platform. A platform worth $2+ billion/yr for Apple.
Much like iTunes, Apple is using the App Store to drive demand for their hardware.
I honestly think it's the only future of marketing as the mindshare we're all vying for becomes more and more saturated/savvy. I've written about this a few times at my agency's blog (http://voltagecreative.com/blog/?s=mutual+benefit) and I'll probably do a write up on this.
I personally know of several people who have recently purchased iPhones and the App store was a major consideration for them.
The apps are quickly establishing the iPhone/iPod touch as _the_ platform in handheld computing making it very difficult for third parties to compete against Apple. With the Palm Pre coming out soon, a lot of people are going to be looking at it like people looked at Macs a few years back - sure, I could get a Pre and you can even argue that it's a better device, but everything runs on an iPhone and I have no idea whether people will port things to the Pre.
Apples knows - or at least should know - that the App Store is what will give them the Microsoft advantage in the mobile space. As everything is iPhone/iPod touch compatible, sales will keep going up which will drive even more app creation which will drive even more sales. What a wonderful cycle, unless you are on the outside trying to compete.
There are plenty of things that suck about the iPhone. If Palm has the insight to spot those and capitalize on them, then they'll win a place in the smartphone businesss.
There are only about 35,000 apps, and the average number of apps per developer (who has an app on the store at all) is probably closer to 2 than 1. Even with twice as many paid developers as people who have shipped apps, you're talking about a maximum of 75,000 devs.
If this is the case, this seems like a very small market for everyone to be fighting after.