You and I have been making the same argument (for many years it would seem) but haven't been reading each other's posts. I was calling it "effective enrollment", but describing the same issue in the same way as you. I hadn't heard the term clearing house but it makes a lot of sense. My kids attend Gibson Southern and as it is a rural 3A school in an area with solid employment opportunities, therefore the number of "free and assisted" kids is low comparatively across the state. That isn't to say "free and assisted" kids are always the "never going to participate in anything" kids, but we all understand it is a factor. All of that said, GS is going to have better participation rates than a lot of public 3A schools. I have done a non-scientific poll with my 4 kids and they say it's anywhere from 15-30% of kids that would fall into the "don't participate in anything category". In my mind this is the biggest reason why enrollment-based classification doesn't work and why there is such a huge disparity in success for equally "enrolled" P/Ps. Folks will always take this argument into a ditch with feeder system analysis and recruiting talk etc. etc. That is all just noise. There are privates and publics who both do all of the little things well to make a program great....but when all things are equal the P/P has a HUGE advantage out of the gate given the enrollment type disparity that they don't like to talk about.