Some people may crave money or power. Some people may crave peace and quiet.
I crave liberty. I crave to live life ON MY OWN TERMS as much as possible. I don't brown-nose, I don't give undeserved flattery, I don't pay attention to "trendy" ways and "trendy" thinking, I don't go places I don't really want to go in order to "be seen"; I simply give honest value for honest pay. A person who can go through life doing that, and survive in reasonable comfort, is to me a success. Because to me, one's dignity is one's most important possession--money is simply a tool of survival and some convenience.
Not that I turn down opportunities to make more money, just as long as it doesn't entail me selling my soul.... I feel profoundly sorry, in a way, for those people who have done that. NOTHING is worth that....
I think most of your average working Americans feel similarly, and many of them will tell you that overall, they feel happy with what they have done with their lives.