I've never joined the national organizations, primarily because it would be quite rare for me to be able to take the time, or expense, to attend conventions in faraway places. In my opinion the best reason to join such groups is for the "networking opportunities." Attending annual SEOPA conferences (which is sometimes a struggle) has opened a lot of doors for me as an outdoor writer, and for my fishing guide business. It is well worth it. And the writing/photography competitions are always fun, and good for your ego if you win something. There might be similar long-distance opportunities with the national groups, but I've never explored them. I've always felt that real, beneficial networking can only be done face-to-face... with either a good stiff drink (Sloan's forte'), or a fishing rod (my forte'), in your hand. Someday when I have time to be able to travel to the "national" conferences, I might get involved.