I think that paid instructors are not needed at all, What is needed needed is for clubs to adopt some sort of training program for beginners, if anything, for safety's sake. Some senior members at my field need to go back on the buddy box. We've had some close calls due to people not knowing what to do when things go wrong, which is the most dangerous part of flying both RC and full scale. I will say that this the hardest to teach someone though.