Andrew Chen: An alternative to freemium? Learning from video games
andrewchen.typepad.com
andrewchen.typepad.com
I am not sure how exactly it would work either. Seems that similar things already happen in forums where you need certain participation to get badges and access to certains threads...
Games like Zelda and MMOs start simple in order to ease you into the game. Yes, part of the fun is the carrot-on-a-stick, but the importance of the whole dynamic is that you're only given as much as you can handle at one time. Gradually, as you get accustomed to how the game works, complexity is increased.
For productivity software, it might be useful to create a tutorial in the form of a game.