In a National Sales Tax plan
It doesn't matter how much Wealth someone has. Who cares how much wealth someone else has? We don't tax Wealth in the US. We tax Income
Wealth doesn't matter with Sales Tax, because we would be taxing spending. That inherited wealth that moves from generation to generation? Who cares how much money someone has in the bank doing nothing. When they spend it and try to improve their quality of life, it gets taxed.
It is a shallow and covetous person who cares about how big someone else's bank account is. What we really care about is how that person spends their money to give themselves a better standard of living than their neighbors.