At Better Medicine, Negoba points out how doctors contribute to the high cost of health care. Even though some doctors make high salaries (some specialists making extremely high salaries), the salaries are not the biggest part of the problem.
A doctor can be just as valuable as a controller of loss as a source of profit. In either case, the amount of money flow a doctor controls is easily 5-10 times the amount he or she makes in salary. Many larger systems with interests both at the office and hospital level will take losses on salary to retain a physician whose orders then net a profit in orders.