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This must be the most naive, distant and uninformed POV on LI rn.
It's not money it's about legacy. He has worked so hard to not be forgotten.

One more reason can be that probably he'll be bored at home. Also he isn't actively busy in politics, so he needs somewhere to spend his time.
Doesn't he feel the need to relax and enjoy life? Both his sons are successful. So, what is this urge of earning so much money for his family?