Well one issue I have seen is that kids go to their club practice after their team practice. This is too much 'practice' for a high school kid. Their bodies need to recover and they need to do home work so that they can compete. Also club Dad's thinking they are the coach during school matches. Screaming from the front row like if they weren't there the kid has no chance. With that, I do think kids that really want to be good should spend as much time on a mat as possible.