Well we do about 15-20 a year so I gues I beleive in them as far as a sport. I do not think they bring that much into actually S.D,principle driven people. I have always said tournaments help with timing but in the street you have no timing it is all reaction.
We do alot because of my son who dreams is being in the Olympics in TKD so that is one reason they other it is good for the school, if you can get great at playing the game you can win which brings in more students and in time hopefully the parents join as well and brings in a great attitude for the S.D. program. I also can see in some Arts they are not needed that much or at all.