I would say it is different in this case because you only go to those CannaMed doctors for 1 reason- to get your medical marijuana card. Paying for the visit is basically just part of the cost of getting the card. There are no upsells, the doctor isn't profitting off you buying the "medicine", etc. He gets paid for your visit and that's it.

So yeah, completely different than a chiropractor or psychiatrist who profits from your ongoing treatment.