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>his cupidity may at some point be satiated

Will it, though?

Bill Gates is giving away a lot of money. Warren Buffet, too. And a lot of billionaires aren't.

So, yes, it may.

Check their net worth. It's only going up.

To a cynic like me it just seems like they're buying good PR, and it's relatively cheap.

It’s possible for both to be true. Humans are complex. Motivations are often a mix of factors. Why would billionaires be different?