They get it plain and simply because they have the players !!
Very few High School teams have more than a few girls that can really play. Teams like Manhasset, GC, ESM, Wantagh, Mt Sinai and others have 20 girls or more that can truly play. That's the only reason they may have balanced scoring. The true test will be when and if they play each is the scoring as balanced or the playing time for as equal.