When asked how much money is enough, John D. Rockefeller is purported to say "one more dollar".  No matter how rich you are, it is never enough.  There is an argument made for having enough to meet your basic needs, but beyond that, there is no reason to believe anything else will make you any happier.

Through my life I have come to believe you can never have enough by gaining more...  You can only have enough by needing (and wanting) less...