Yeah the private schools that use seminar-style manage it by 1) having much higher incomes than $15k/yr/kid, and 2) avoiding teaching kids who have special need

Yeah the private schools that use seminar-style manage it by 1) having much higher incomes than $15k/yr/kid, and 2) avoiding teaching kids who have special needs, since they can cost several times as much to educate as a kid who doesn't, and besides, they tend to drag down test scores and university acceptance rates.