To me, it makes sense to train in a Ninja gym, because this has become a sport. Maybe ANW competition is the most visible competition within the sport, but there are Ninja competitions taking place all over America, and if you want to participate and excel in them, showing up at a Ninja gym makes sense - and a fair amount of Ninjas, male and female, are choosing to do just that. It's just like how with track and field, the Olympics isn't the only competition, but rather there are smaller races run over the country and track clubs a person can join to help further their running skill. That doesn't mean the track clubs are the only way, but it's a lot harder to go it alone, and I'm not necessarily going to give someone extra merit at the Olympics just because they chose to train without a coach. Same with people who choose not to visit a Ninja gym or don't live close to any. They can achieve success without one, but I'm not going to necessarily give them extra kudos over somebody who decides to maximise their ability by joining a Ninja gym.