The problem of anyone who has a productive incomeLet's say that on top of your current income, I give you an additional $10K, every month, with the condition that you must spend the whole amount by the end of each month.
You are not allowed to invest it in any way whatsoever (including trying to double it in any form of gambling), or give it away to friends, family, or charity. You are also not allowed to spend it on vices like women, alcohol or drugs.
How would you spend this extra cash?
he bought a yacht at some point ^Once you can afford to own (and maintain) the best of everything (which requires way more than $10k per month) you start collecting things, which might become a vice. At the end, you become owned by your belongings, and a slave of your servants.
Your life is not improved by material things after a certain point.