They are kind of a scam, though
"No, you can't take your own Tylenol, but you're welcome to these $10 a dose special hospital Tylenol."
"Please enjoy these mandatory $25 grippy socks."
"This procedure will only take five minutes and you don't even have to take your clothes off. $5k, please."
Everyone goes on about insurance, but hospitals get up there right beside them in your poophole. Whatcha gonna do. Basically boils down to how long you want to live, and how much you want to be in debt when you die.