@Cycloptichorn,
I agree with that. Unexpected large cash demands are a problem if one is unprepared for them. We deal with things like that generally through insurance and loans. For example we buy automobile liability insurance because most states require it and because the risk of an adverse legal judgement and the attendant high costs is very real. We also often pay more to buy collision insurance to protect ourselves from the unexpected large cost attendant to replacing or repairing a vehicle. High deductable health insurance policies that don't cover routine costs of medical exams and ordinary care, but do offer protection for high cost treatments are available and at much more reasonable prices than the HMP and PPO policies that most folks depend on.
Yes I have had the experience of paying cash for medical/dental treatments and also asked for and got a 10% discount on the normal rates. However, to answer Parados, it wasn't in an emergency room.
Most people spend much more on transportation, food, entertainment and rent or home ownership than they do for medical care. Why should medical care be in a category all by itself? Food and lodging are just as essential for life and health. We have active marketplaces for those services & goods, and they serve us very well in terms of quality, quantity and the price of goods available (certainly far better than have any of the socialist experiments the world has seen over the past century).
I'll readily agree that even the best commercial medical coverage plans involve a degree of chicken **** and extra administrative cost. Like any insurance policy they also involve limits on cost and coverage - otherwise they couldn't continue to exist financially. We only have the illusion that government programs can't fail in the same way. However as the Greeks are learning, and as many state employees and pensioners here are learning that even the government's purse can end up empty (The city of Stockton filed for bankrupcy yeaterday).