It's a bit more accurate for non-game apps. Those are a lot more likely to have recurring revenue. Still "the majority below $10K" would probably still be true at $1k or even $100. And if you've got a 10k app it might take 10 years for that $ to trickle in. I'm an iOS dev by day, but I wouldn't do an indy iPhone app with any real hope of making money in it.