@ned @kibrika I study human motivation, and your question is easy.
"Billionaires" is a very specific subgroup of people, and their characteristics cannot be generalized.
However, the problem with meeting the basic needs is that work (all types of it, including homework) gives the sense of fulfillment. People whose work is redundant, are expected to struggle with the sense of being useless.
For billionaires, this sense for various individual reasons is exaggerated.