> That's the thing, you can only have that kind of number for so many years before you start really not wanting it to get down.

Why shouldn't this be classified as a mental illness? Imagine a monkey hoarding more food than they could possibly eat, to the point that it lies next to them rotting away, while members of their tribe are dying from starvation. We'd immediately say that there is something wrong with that money, but why do we feel it is normal that some humans hoard an insane amount of money?

Having a billionaire who believes they aren't rich enough and need to make more money is like an anorexia patient believing they aren't skinny enough and need to lose more weight.