Think of it like this. You go to dinner but the prices aren't posted on the menu. When you get your bill it's $500 while the guy at the table next to you gets his bill and it's $25 for the same meal, the difference being that his company has a pre-negotiated price list that keeps the restaurant from charging arbitrary prices for food, you don't have that so they can charge whatever they want and there really isn't anything you can do about it, there's no law saying they can't do it.
The "system" is designed so you're screwed if you try to pay for your own health care, you end up being charged many times a fair price. It almost forces you into either having overpriced health insurance or being a freeloader on medicaid. It leaves prople little other choice because unless you're allied with an insurer the hospitals are going to stick it to you just because they can.
btt
What he ^ said