

For developers, the big takeaway is that it doesn't pay to just give your app away—unless you're in the uppermost echelon of successful apps, there's no way you'll make any money with ads in a free app. There is, however, evidence that offering a free lite version of a paid app can boost sales.
But generally speaking, your app is going to have a short shelf-life: In the App Store, because of the way it's designed—for "maximum turnover—and because of the way people appear to be using their apps. It helps if your app is a game, which fares a little better than other cateogries, and you know, maybe if your app doesn't just make fart noises. [Pinch Media via TechCrunch]