Should you tip at a med spa?

Medical estheticians at medi-spas are trained above and beyond regular estheticians, provide their clients with the utmost in technology and safety, yet do not receive appreciably higher pay. When you are tipping your esthetician, you ARE NOT tipping a physician because you are not receiving a physician's service, for which you would pay a consult fee instead. Why would you NOT tip someone who is providing you with the best treatment possible? It is proper etiquette to tip an esthetician, whether in a doctor's office, medispa, or regular spa.