At my studio, it is my business and profession. I am a highly educated and capable instructor. I charge fees that are in line with the fees and abilities of our profession in my area. I do not accept tips.
If I were working for a resort or gym, sure I would accept tips as a form of appreciation from the customer/client. But in my studio, no tips for me. If an employee gets a tip, that is not a problem. They must have done something right to be getting it.