I have had this same question pop up in my life on more than one occassion by many different people. ALL martial arts, including the koryu (the ancient traditional schools), had a beginning. ALL of them were created by someone and refined by someone else and so on until we have what we have today. So for someone to make up a fighting style does not determine if it is a legit or illigit art. In my humble opinion I think that if someone creates an art and knows it inside and out and can both apply it effectively and teach others to do likewise then their art is as legitimate as Shotokan Karate and Shaolin Kung Fu. I agree that just because you have never heard of a style before it doesn't make it illigitimate. The world is a big place and we don't know everything, so to dismiss something prima-facia without knowing all of the facts is just arrogant and ignorant. It should be pointed out that in China there were many, many, many family styles at one point. A lot of families had their own secret fighting method that they started to teach others and either those methods died off, were changed, forgotten, or codified into something else. They can still be found today, though not easily. I know of one master that has inherited his style from it's original founder and believe me when I say that he is one of if not the most incredible martial artist I have ever seen. I think all people should be quick to listen and slow to speak. That way they may just learn something.