You would have to be very rich indeed to achieve the same level of cover as is provided in comparable economies (UK/DE/AU etc), because the insurance is expensive and out of pocket costs / copay is high, and you may discover you cannot get or maintain insurance once you develop a chronic condition.

But even if you dealt with a broker and crafted a special insurance insurance product to deal with the eventuality of being denied further insurance, you are ignoring something significant: you don't improve the quality of life or lifespan of the population by making healthcare only accessible to the rich.