Yo it's the fun aspect of starting and running companies why people do it. No job can come anywhere close to the satisfaction of being an entrepreneur. Think of it as a serious game. Talking about money and changing the world, only a very few people have that idea on their minds. Think of people like Elon Musk who are mad about their mission and bring out a revolutionary shift in the way things work. In the end, it's all about money. The only things that people do for free are charity drives.