Grappling hook peg

Why do the extremely wealthy care about another billion dollars? What's the point? Is it power? - power yachts

That may be a silly question, but how much money is really necessary? Then, there are many homes in Nice, jets, airplanes, yachts, all good things, and many beautiful women, what will the point for more money? After one billion, why so many efforts to achieve more? Is it only the power over others? Is it just the love of power, for the sake of power?