Sunk Cost App
Problem
Many "free" apps get people hooked and then get them to use in-app purchases to pay for the ability to advance more quickly through the game.
Idea
This app takes the concept to a new extreme. The app is free, in the sense that you pay $10 for the app and then you collect $10 when you complete the game.
However, the game becomes fairly difficult and time consuming, and we offer you the ability to "buy out" of the game part way through. For example, when you get half-way through the game, you can pay $5 to get your $10 back. So your net return at that point is $5 for quitting the game, and you get the value of your time savings as well.