You could as a US private practitioner! Skip the government bureaucracy, patient noncompliance, and chronic conditions and make out like a bandit with some basic business acumen. The only problem is the demographics work against you in anything but elective procedures (plastic surgery and cosmetic derma) because healthy people don't require as many drugs, surgeries, or appointments and preventative care chokes off the cash cow that is treating chronic disease. That and only 30% of the population is neither obese nor overweight. 'Tis a challenging path for many an aspiring shitMD, I imagine.