When you join the KDA, you gain access to many benefits of membership. Primarily, of course, you get continual guidance from highly skilled and certified instructors, experienced evaluation for Dan and Gup rank promotions, the right to participate in local and international KDA events, and dozens of other practical advantages.
But the best reason to join is for Dangsudo itself.
Dangsudo is not an easy martial art. But it is an art. And like any art the more you put into it, the more it will repay you. Dangsudo enriches you physically, mentally and spiritually; developing your Neigong, Weigong, and Shimgong (Internal, External, and Mental/Spiritual Practice).
Because the KDA is here primarily for the preservation of the historical martial art of Dangsudo. And for this to be a reality, all of the aspects of the art must be preserved... not just the physical. The goal of the KDA is help you develop as a whole person in the way Dangsudo was meant to be taught.