Bea,
My wife is an RMT at a chiropractic clinic in Ottawa. Although she never expects a tip, she won't refuse them, and has received her fair share. A struggle RMT's deal with constantly, is to be seen as a "legitimate" health care provider, as opposed to the --other-- type of massage provider, and tipping plays into that negative image (no offense to any MA's reading this). As she has said repeatedly, "You wouldn't tip your family doctor or dentist, would you?".