Seems to me that this is an effect of selection. Why are people not satisfied with having million dollars? Because the personality type who could become satisfi

Seems to me that this is an effect of selection. Why are people not satisfied with having million dollars? Because the personality type who could become satisfied with having million dollars, would probably also be satisfied with having half million dollars, so they are unlikely to ever have the million dollars in the first place. People who want "exactly one million, not less, not more" are less frequent in population than people for whom no amount of money is ever enough.