How come Saudis live more lavishly than Americans if the U.S. is richer than Saudi Arabia?

The United States has a higher average household income compared to Saudi Arabia, but the gap between the rich and the poor in Saudia Arabia is greater than the United States. This means that rich Saudis can live lavish lifestyles at the expense of the lower income citizens.

Some of the poorest people who live in Saudi Arabia are not actually citizens but immigrants from other countries who came to Saudi Arabia for better opportunities. Although this happens in the United States as well, there is a more direct relationship between poor immigrant labor and lavish lifestyles in Saudi Arabia compared to the United States.