Ah the American conquer, might is right arguement. No wonder your country ranks pretty high on the misery scale... There's more to life than "dominating" industries.

Edit: I should qualify this a bit more. If it does make you happy to basically have no life outside of a career, then go for it. Everyone's happiness is something only they can answer for themselves. Some people can tolerate being lonely, and I'm pretty sure Steve Jobs was a lonely person (after reading the Isaacson book), despite having people around him.