>He enjoys thinking about math. He doesn't need $1M to think about math. Ergo, he doesn't need $1M.
The fallacy there is the assumption that he will never need $1M to think about math. He could get hit by a bus next week and need $1M for medical care.
(A quick Wikipedia check says that Russia has public health care supplemented with private providers. Suppose here that his injuries were bad enough that the public system wouldn't completely heal him.)