“The economics were certainly a factor. If the App Store got one thing right, it’s the ease with which you can buy an app for your iPhone. It’s two taps. There’s more of a hump with Mac apps, and people are used to try-before-you-buy. The other factor was Fusion Ads. (http://fusionads.net/). They serve some of the most beautiful ads around. Many people mentioned that they registered Tweetie but then opted to keep the ads on anyway (there’s a checkbox in the Preferences).”
