I find that if you have your own ego under control (as a range instructor), you have NOTHING to lose, and everything to gain. If you are a good shot, you not only demonstrate technique, you have the opportunity to teach humility, self control, and a pleasant spirit of drive and encouragement. Suppose you are VERY good. You can play it down, telling your student(s) how you got to that level, how often you shoot, etc. They can gauge their ability, and where they want to be, against the range officer's level. If there are shooters that can equal or better the range officer, then the range officer can set the mood for accepting the same, and recognizing the students' talent in a positive fashion. The range officer teaches more than just technique. He can contribute his take on ethics, morality, "esprit", and positive interaction among shooters. When I have taught, I always get some shooting in to demonstrate that I can do what I'm telling them to do. I think that it is very important to establish credibility in a class, such as shooting techniques, where "hands on", demonstrative actions are being taught and asked for. I have been humbled by some good shooters, and I always acknowledge them in front of the other shooters. I have never had an exceptional shooter act like he knew it all, and be a problem. Even the best know they have something else to learn from another. I am sorry to say that some people become range officers BEFORE they reach a suitable level of competence themselves. Now that is ego talking. Would you pay to take a class from a green or brown belt karate instructor, when you can take a class from a black belt? There are no such designators or controls in certifications for instructors in most shooting schools or classes. A lot of people don't just sit back and accept or assume the guy at the front of the class is qualified, so it HELPS if an instructor can "back up his mouth", if need be. You CAN decline a demonstration, but I think you damage your credibility, as if you have something to hide..........