Ah, you are right, I missed the part about life expectancy. Of course, the $75k number is based on working individuals- I expect the number will be completely

Ah, you are right, I missed the part about life expectancy. Of course, the $75k number is based on working individuals- I expect the number will be completely different for non-working individuals. People who are not working both do not enjoy the same life-satisfaction that can be had from rewarding employment, and do not suffer the stresses of that employment, so who knows where the balance of happiness lies. Perhaps if we are talking about someone who is not working for their money, there is no such thing as "enough", as they have no happiness "cost" to simply having more money (as they do not need to work for it)?