The simple user interface allows users to adjust mouse and keyboard clicks, the sound of paper crumpling, sharpening pencils, and the common sounds of a wet-ware operator (clearing throat, sniffling, and blowing into a tissue).
At $0.99 from iTunes, it is priced to make small profits on many downloads.
The business model for iPod apps can be described as small, cheap, and democratic. It is the antithesis of the huge, expensive, and centrally-controlled production model (i.e., Microsoft).
Is the bazaar model the next killer app? Or just another killer nap?