buying 30 dolls for your kids means you're poor
That doesn't make any sense
Poor people should act more like wealthy people. Have nice things but not too many things.
Nothing suggests rich people are rich because they have fewer things. The shoe analogy is that cheap shoes wear out quickly meaning that having the money, knowledge, and means to find high quality shoes and still have money left over to cover all your other immediate, more important expenses, makes it so that the poor spend more on necessities than the rich long term.
But then the rich can also buy whatever cheaper shoes they want too, not necessarily through long term savings that then become moot, but by many, many other factors that require even more money and connections.