There are different kinds of "motivation by money". Some people are in a situation where if they don't make enough money, their children will starve. Some people already have all they need, and more money is just some kind of "score" to measure how successful they are in their projects; to compete against other people in similar situation. Some activities bring average money reliably. Some activities have a small chance of huge success, and a big chance of nothing. Not having to make money frees your hands to do the latter kind of activities, without putting your family in danger of starvation. For example, you can spend all your day writing a book, with the goal of becoming famous. If you fail, no problem. If you succeed, you can make a lot of money. Yes, the probability of such outcome is small, because it is P(doing something like this if you already have enough money) × P(succeeding).