That presumes that running a business is something you want to do in the first place. In that case there's a more general passion "running a business" that you'

That presumes that running a business is something you want to do in the first place. In that case there's a more general passion "running a business" that you're already pursuing. Not everyone necessarily wants to do that. I'd also disagree that if you're successful at something you become passionate about it. Cuban's basing that on what exactly? You can point to any number of people who left various high paying jobs in fields they didn't like and ended up being much happier doing work they cared about in a field they were passionate about.