At the moment, there is some discussion on QiJin about the advantages of these skills and how they give an advantage in martial-arts.... but now some people are beginning to see that if they show everyone how to do these things, the advantage can disappear. If nothing else, there are levels of these skills and by showing them beyond a basic level (e.g., on video) someone moderately knowledgeable may learn a trick that they didn't know before.