The Board shall regulate the practice of barbers, body artists, and cosmetologists, including specialty cosmetology practices such as braiding, electrolysis, esthetics, manicuring and others as the Mayor may from time to time establish by rule, instructors and managers of these practices, and owners of such facilities. Not own, operate, or be employed in or have a household member who owns, operates, or is employed in a business which has as its primary purpose the sale of goods or services to practitioners of a profession or occupation supervised by that board.