If you're an OB/GYN in the west, malpractice is upwards of $200k per year. You MUST REMEMBER THAT REIMBURSEMENT FROM INSURANCE DOES NOT INCLUDE SUPPLIES. So, everything your doc uses on you to sew you up may cost him $1k and he gets reimbursed only for the vist (say 20-30 dollars for 15 minutes for medicare).
These guys are GPs and internists. They probably don't pay more than 20-25% of what an Ob/Gyn pays.