I will tell of one thing surely, that the rich or "super" rich however you put it, worry and even think a lot more than you can imagine. The thought and worry of how not to become broke, how to make more money to sustain their lifestyle and do better keeps bugging.
there are different ways one can implement his/her hard work, it could physically, intellectually, and technologically, and there is always a reward for it
Some will propose that the intellectual requirement needed to build wealth is even more demanding than the physical work that OP considers hard work alone. Please do not downplay the efforts of men and women who have worked hard intellectually also to be where they are today.