Or in other words, the effort is the reward.
A simple thought: the more effort something requires in the more difficult it is, the more rewarding it is. Thus if your goal is to maximize your feeling of accomplishment and reward in life, perhaps seeking things with the max more amount of effort within your own bounds and realm is ideal.
For me this is why powerlifting is so rewarding. When you achieve a new one rep maximum lift it is a result of the insane amount of effort you put in.
Also, if raising children wasn’t so difficult, it wouldn’t be so rewarding. Also in Photography typically the photos we are the most proud of might have been the most difficult to shoot. And the more difficult the photo was to shoot the less likely it is to be replicated.