I was never really aware of the reason Wozniak left Apple, I figured it was because Jobs was mostly in it for the money and their relationship inevitably went downhill. I remember an interview with Wozniak, something I'll always remember, it went something like this: "I went to Steve and showed him this awesome new system I had been playing with, 'Isn't this awesome?!', I said and he replied 'Holy crap, we could make so much money off of this!', 'I suppose you're right'".

Edit: bad grammar.