Yesterday there was an app called "A mirror" at the top of the Top Grossing list selling for $499.99. The developer, SufPay, has no website listed and has only released one app. The app displays images of picture frames that are simply black in the center; that's it. It's by a different developer, but it definitely seems to be part of a similar scheme.
I checked just now, and the price has changed to 99¢, but it's scary to think that a completely useless app 'sold' enough copies at $500 a pop to become the top grossing app on the app store.