33 Ways to Monetize Video Games!

So I was asked to talk on a panel at the Social Gaming Summit about the three main ways of making money from games, so I decided to do some homework. That turned up 8 ways of making money in the game business.
I figured there are more, and now I’m up to 33.
The great news is you can combine many of them, so any new game design has a menu of options here.
I’m not sure what the FINAL amount will be, so please tell me the ones I missed?
33 WAYS TO MAKE MONEY
David Perry.