Interesting observation ( the bodies etc ).
   If one looks at top flite Amats or Pros, one should remember, yrs of practice have gone into developing a toned body .
 On the other hand, there was a couple that danced as Amats in the late 40s early 50s in the UK, where the man was "portly " and the lady very slim. They became the SE Uk champions .
            Scrivener once made an interesting comment..he said that Silhoutte was an important part of HOW we display ourselves on a dance floor .
        Being an adjudicator is about "opinions".. thats why we have  an odd number in major events ( it should create a majority ) .
             AS to paying dues , of course, if one is seeing the SAME couples over and over during the course of a yr, then it does simplify the task to some degree ( not always ) in fact, to some degree it helps .
        The more difficult thing to adjudicate are the " newcomers "  ,especially when there are heats that are sometimes on a crowded floor . 
        And if anyone thinks its an easy task, then think again ( it can be very tiring mentally and physically ), standing for hrs on end .