Today I found some links to stories about those who have no insurance pay for medical care many times what Medicare would pay. A trite example is charging more for a single over-the-counter pill than the hospital's own pharmacy would charge for a whole bottle.
If you have a few hours to gnash your teeth, read
"Bitter Pill: Why Medical Bills Are Killing Us", Steven Brill, Time, 2013-02-20
"Healthcare Isn't a Free Market, It's a Giant Economic Scam", Mike Masnick, tech dirt, 2013-02-22