Earlier quoted context omitted.
There is a HUMONGOUS difference between owner of a business and employed by a business. Makes sense for the "10th richest person in the world" to work long hours. It's his call. He is working basically for himself. Totally different when you're making say 50K and the "10th richest person in the world" wants YOU to work all day every day too.
There's nothing wrong with being passionate about your job
Just look at the game dev industry. Lots of passionate people there, and lots of companies who will exploit that. In the end, those people lose their passion.
Being passionate about work can make you very happy. But always make sure you don't get exploited because of it. You will need to set your limits.