Most of the US has a low cost of living compared to eg Switzerland. In most of eg Texas - most of the US actually - you can live well on $50,000 to $60,000 per year.
You're aware I'm guessing of the economic metrics of the top 50% in the US? It seems obvious to me that in fact you do not have to be mega rich to live well. The top 80 million Americans in the labor force would likely qualify as having at least as good of a life as the median Swiss standard of living.