You have to spend a lot of money to find out if the complaint is a "true emergency" - or you have to ban lawsuits for error.
"Showing" someone that you have "enough" money requires an overseer, a despot. Traditionally you only needed the marketplace to find out if the buyer has enough money.
Also note that traditional insurance companies can out of money at any time. They won't run out of money in the bank - but they can run out of *your account's* money. They will not deliver an infinite amount of financing to treat you; it is not even mathematically possible.
This means that all medical services are limited in scope. A self-insured person is not any different from an insurance company; both aren't willing (or capable) of paying too much.
It is much easier to charge money for all services that a commercial entity offers. Those who can pay do pay; those who have no money have to depend on a credit. If there is no credit there is no treatment. Illegals can surrender to DHS, get treated there and deported. Poor but healthy citizens will be required to do community work until their debt is paid off. Poor and sick citizens will be supported by taxpayers.
Anyway, Obamacare has a big problem with self-insured people. It will not be permitted on an individual level, and will be restricted to a couple of named groups on a group level.
So how do you feel about car insurance? Should we allow any yahoo to run around without liability insurance?
You do not have to buy a car insurance. First, you don't have to buy a car in the first place. Second, if you do own a car, you don't need to buy your car insurance from an insurance company. There are other options. You can deposit $35K with the DMV; you can be self-insured (requires that you prove to DMV that you have money); you can also get a private surety bond for the same $35K.
I personally buy my car insurance, but that's because it is cheaper this way. I think I pay $300/yr for one car. That is 0.85% of the $35K. If I have the $35K I would be far better off investing the money because I can get anywhere between 3% and 5% from municipal bonds, for example. But this choice is mine and mine alone. Obamacare takes this choice away from me.