The US has been formed religiously by various congregations that descend from Calvinism, which teaches that hard work earns you the grace of God. In modern times, this has morphed into Prosperity Gospel which teaches that if you are loved by God, you will become materially successful, as well as the flipside; if you are materially successful, you must therefore be loved by God.

The billionaire worship is simply the secular version of this faith. X made billions of dollars by owning a business that does Y, therefore X must be an expert on Y, and businesses in general, and is a genius, and is a morally superior person. Otherwise X wouldn't be a billionaire, because - horror of all horrors - the world is just, isn't it? It couldn't be the case that X just got lucky, can it? Surely, X has earned their billions, right?