When Amazon announced Amazon Underground, a new app marketplace where many freemium games are made "actually free," everything seemed pretty great. You can make in-app purchases on apps downloaded from Underground without actually spending money, which is my favorite way to buy things. Of course, if you spend much time thinking about how this must work behind the scenes, it's tough to see how this will be a winner.

Amazon has been kind enough to share the nitty gritty details. Here's the short version:

  1. Developers agree to waive the fees for in-app purchases
  2. Amazon pays developers 0.2 cents per minute of use, per user
  3. ???
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