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>Then you could say that the average person's 401k isn't being used either.

But the average person has much more marginal utility for their amount of wealth. Going by the average 401k balances here (https://www.investopedia.com/articles/personal-finance/01061...), the marginal utility of dollars $38,401, $160,001, etc is much greater than even millions of dollars at Bezos and Gates level wealth. What else am I missing about utility in this context?

>Gains on those investments are also taxable.

At a much lower rate than income, further cementing the advantages of the ultra-wealthy.