Why not let others bear a piece of the risk?

It's actually quite a common thing in all kinds of markets. For example real estate investors often use other external credit (like from banks) even though they could easily pay for the real estate by themselves entirely.

The vast, vast majority of rich people don't have tons of liquid capital sitting around. Most of Elon's wealth is in stock that would tank if he sold it.

And you always want to diversify investment.

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