I wonder if that is generally true, that the most successful people are the least likely to appreciate their success. Seems to make sense per what you write - these people are likely to be successful and driven because they are insatiable. But, if you are insatiable that means you can't be satisfied, and don't appreciate what you have.

Ironically, it is the more satiable people, i.e. the less driven, who often envy the successful.