Like even if they are stinkingly Rich.
I don't know what it's like to be very wealthy but I find it very hard to believe. Financial security for you and Your immediate Ones comes one get to a certain level.
That statement is only heard amongst Nigerians, Oyinbos don't really talk like this. Some Yorùbás would say "Owo o 'n tolowo", meaning, Rich people are never satisfied with money no matter how much they have.

Money has never, and will never make anyone happy, nor bring satisfaction.
Pursue happiness and satisfaction, and if money is part of what will give it to you, it will come on it own, to how much you really need it.