Well, instead of Apple taking all your money, their giving away one, $10,000 App store card, for the lucky customer who downloads that all important ten billionth App. (But once you've seen the speed of the counting- you probably wont bother trying)
Now, Ten thousand dollars is a lot of money, but to spend on the App store... That has to be a life time supply, seriously. What would you do with that sort of money on the App store?
Check out the link for the count-down (Or count-up) - App store ten billion