I believe that wealthy people have phobia for poverty, they are afraid to become poor like the those that comes to them for help. This is the reason why most financially wealthy people will do almost anything to become more wealthy because it is better to go from grace to grace than descending from grace to grass. Everybody wants the good life and those that have it knows that if they relax they might not be able to compete with other wealthy people.
Apart from the fear of being poor being the motivation why the
Rich can't stop building and expanding their wealth, most of them didn't inherit generational wealth they started as poor people before becoming wealthy and during that time they knew how the society treated them and now that they have experienced a different life which is the better life going back to their old life they will never do anything that will take them back there.