I list my occupation at Mystery Shopper and have done so since 2005. If an MSC has a client that wants shoppers with specific backgrounds, it is up to them to specify that in the offering or the guidelines. This is fairly rare, but, for instance, "Experience in restaurant/hotel/medical office might might be requested. Otherwise, not to worry.
Based in MD, near DC
Shopping from the Carolinas to New York
Have video cam; will travel
Poor customer service? Don't get mad; get video.