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But then there's the morality of it, because you're essentially expecting people to be highly motivated by not-money for your own pleasure. Which might be the case today, but I don't necessarily think will be the case forever.

Yes, musicians for instance will always create music, even if they're dirt poor. That doesn't mean though we should strive to make them as dirt poor as possible to maximally optimize the agreement in our favor. That's a separate issue.