Bomber-good post. To me, here are several differences from the soccer high school and club seasons.
High School- games mostly during the week. Very little travel. No long trips across the country, or to Florida, Virginia, DC, Raleigh etc... Huge cost differential.
Plus the high school players truly love playing for the school.
Club- for the most part (say we are looking at an entire state) better training, coaches and competition. All that said, if you are talking about Premier players.
Compared to other sports, yes they have Club type teams and events, but they typically occur out of their high school season. Soccer is doing more and more during the high school season. You begin to think, what is really the Club's motive. It is obvious, they make their schedules without regard to high school play. Thus putting players and parents left with tough decisions to make.