> the money used to buy that yacht paid the salaries and income of all the craftsmen and laborers that built it for you, compensating them for the value they provide to society.
The point he is making is that they are compensated but no net value is returned to society as a result of their labor and resource expenditure. The yacht "disappears" in your private marina where it will rot away providing you with a purely private satisfaction, whereby the same labor could create houses, a public parc or some other widely shared goods, whilst still compensating the workers the same and having the same overall economic effects.
Symbolic, money wealth, thus becomes a force that diverts social physical resources away from social needs and towards private needs of wealthy individuals, making everybody else worse off compared to an alternate more egalitarian social arrangement.
I would interpret it that as long as billionaires don't sink their fortunes into megalomaniac wasteful personal consumption, like say building pyramids, the results of capitalism and inequality are not very different from a more egalitarian society, the vast majority of resources are still employed to make most people better off. What's unequal is just the representation of wealth, who owns what and who works for whom.
For example, if Warren Buffet would start to liquidate his symbolic wealth to build a giant Warren Buffet statue, this would have a net negative effect on the wealth of the average citizen. Yes, it would provide jobs, but it would also extract available capital from the market that could be invested to create other jobs, so over all it's a wash. No saleable products are generated and a massive amount of resources is required, bidding the prices of these up without putting anything back. The consumption of everybody else would diminish to accommodate for the higher prices and lower overall quantity of products now available. Society has "decided" to shift production from cars and houses towards a giant statue that nobody really needs.