TechCrunch: iPhone Apps: One Month And 60 Million Downloads Later. But Not One Of Them Is A Killer App.
If an application is 99 cent, it doesn't matter if it's a killer app.
A hamburger is 99 cent, too. It disappears in a few seconds. Why wonder about applications which are 99 cent? If I'm using the application for more than 60 seconds, it's a great deal. If I'm using them for a few minutes, it's a fantastic deal. That's way longer than it takes to wolf down the hamburger. I may even have fun using the application. Plus it's way healthier...
So, why bother?