One of the problem of rich and wealthy people is they want more; they have a hard time moderating their greed; its part of being a human not to be content of what they want in life, they keep investing; they keep keep growing their investment because they want to be on top because they want to enjoy what luxury can bring in this life and many rich people suffers from healh problems because of over indulgence.
We can also say that reason why the richer invests to get richer might not really been on the consent of greedy but with the fear of getting broke.
Loosing unrecoverable net worthare usually cases of settling for less such as being contented or the fear of bearing further after which one was lucky to had acquired wealths.
Also knowing that stacking huge amount of savings with no potentials to yield incomes would depreciate gradually untile one goes poor and could even not be able to afford average living anymore after much living a luxury life.
Not funny to say but the fact is that being poor is like hell compared to riches which feels like heaven.