You can pick up the pocket edition of Minecraft on iTunes for $6.99 right now. This version lets you build, but not adventure, in the fun, blocky world. So no crafting, mining, enemies.
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Notch doesn't have a clue how Appstore dynamics work. It's 99 cents -> conquer the world and become a rich man as 20 million people buys your game. Price it 6.99 and you get 20 000 sold games for a week.