You have not made it clear why you would prefer to prescribe drugs for hairloss rather than a surgery. It is safer in every way to administer a hair transplant. Perhaps you realize that patients will opt out of treatment altogether since many men would never consider the very significant and costly method of pursuing a transplant?
I would use a non-surgical recommendation for a wide range of problems (e.g. many forms of heart disease, Parkinson’s disease, epilepsy, herniated lumbar disc). In some situations, I would recommend hair transplants as I get to know the patient if I am convinced that it is in his best interest. That puts the burden on the patient to convince me about his agenda.
I am not a plumber who is fixing a leaky pipe. I am a caring, responsible doctor who always does the best thing for his patient. Think about how strongly I must feel about this. I would rather offer a free consultation and then prescribe Propecia for a total fee to me of $85. My average surgical fee exceeds $5000… so I must really believe in the welfare of my patients to turn that down.