[edit:] Just to be clear: I was trying to be snarky.
I have no particular knowledge why some malpractice insurance rates are so high. I didn't address that. I was trying to point out that numbers I've seen indicate typical malpractice rates are not the dominant expense in a doctor's office.
Even in practices where they are spending $100k for insurance, I would bet that salaries are higher. I could be wrong, of course.
FWIW.
Cheers,
Scott.