I'm not placing a blame game on all doctors. This healthcare mess is not a fault of theirs. They are a cog in a very large wheel. Like I said in m,y disclaimer, a FEW doctor's think they should be paid above and beyond all others. Most do not. Certainly every office manager/administrator believes their doctor is the absolute best in the state!
You are correct, doctors do get paid a percentage based on their area. Medicare reimbursement is generally used as the base (which is a scary place to start considering how they pay!) and a doctor's fee's are dependant upon how they negotiate with the insurance company. Usually, the more providers in a group, the more negotiating strength they have.