Nice, informative post, thanks.
Being completely uninformed about the realities of medical practice, I find myself asking, ''OK, why can't you do this?'' Not being a smartass, here -- I'd really like to know. Some sort of regulation? Ethical rules? I haven't a clue.
Would you please elabourate a bit? In layman's language, please ;^)
My guess is the cash market is too small.