The rule as I see it is to stop kids from going to schools outside their school district. Town "A" has an AAU team and a couple of kids from town "B" and town "C" play on it. When school opens up in August, all of a sudden those 4 kids show up to enroll at town "A's" school. The 50% rule will help stop this "legal" recruiting. Bottom line, in my opinion, kids need to go to school where they are SUPPOSED to go to school, whether the "Ball Team" is championship caliber or not.