Why do many wealthy people still go to work?

The "Creating Something Out of Nothing" series, Part 1: My older brother has been into crypto for a long time and is very wealthy,
working overtime every day until very late.
I asked why he's so driven despite being so rich—trying to reach the next level?
He said: "Unhappy marriage, hiding from my wife!"
I asked again: "If that's the case, why not get a divorce?"
He said: "Because she can claim half of my assets."
Are there any other tricks netizens know to avoid splitting half of the assets? $btc