[JSteff]

There is a money making opportunity here for some smart docs who accept nO insurance but accept cash only. They could dominate enough of the market that they would be quite a force to reckon with.
By not allowing insurance they cut the expense of the overhead of a staff. Cash only is a huge market equalizer. Also allows a reduction of the costs of care and procedures that will allow market domination.
The lower prices would cause other doctors (insurance types) to try to compete throwing the market into a mini battle. Non-insurance docs who offer lower prices would really make obamacare patients want to not be on obamacare causing the younger and non heavy users to rebel.

[HiTech RedNeck]

What has also worked is single-office health maintenance plans. Anything that can be treated in the office is treated, for a flat monthly fee. No more insurance bookkeeping, just a list of the patients and the minimal billing overhead for the subscription.