Great Question! What could have been one persons’ “niche” or “specialty” in thier scope of CPT may change over the years. Many factors come into play, the once popular “niche” may not be as popular today or it has been renamed or repackaged.
A person might move to another facility or state and have to change their style or learn a new specialty to make a living. Or simply to grow, better themselves, as a CPT and learn new training methods and excel in their profession.