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Re:Twitter has officially changed its logo to ‘X’ by inglor_cz on Monday July 24, 2023 @08:54AM (#36847220)
"But I'd be surprised if a significant number invested their entire net worth and time into a single endeavor."

AFAIK Musk was a relative nobody in the millionaire world when he poured a majority of his wealth into SpaceX (2002). They were very close to bankruptcy during the Falcon 1 experiments and if the fourth launch failed, they would have joined a fairly extensive graveyard of defunct space startups, together with Carmack's Armadillo Aerospace and a few hundred others.

Re:Twitter has officially changed its logo to ‘X’ by ethbr0 on Monday July 24, 2023 @10:27AM (#36848538)
By that point, he'd already been CEO of PayPal for a bit (after co-founding X.com that merged into the company that became PayPal) and made $175M for his stake when eBay bought it.

Then $100M went to found SpaceX.

But that does seem like a very large bet that millionaires don't often make.