It isn't as much about affluence as it is human capital. P/Ps will ALWAYS having a higher percentage of quality, results driven student athletes for no other reason that they are paying to be there. They are paying for a certain experience.....it is a transaction that has value for the parents. As with any other transaction for services, there are expectations in quality and performance for both ECA and academia. Conversely, in public schools, a varying percentage of students are there only because the law says they have to be. The result is more quality human capital per capita at a P/P. The example I have used in the past is how Castle and Memorial seem to go toe to toe in both girls and boys conference championships each year within the SIAC and seem to both produce a similar number of top notch athletes in various sports. Castle has 1965 students, Memorial has 609. Our Catholic friends would like us to believe that is because of the blood sweat and tears of their Irish/German ancestry genetically instilled in them a work ethic no mere protestant can match. It's really not that complicated....birds of a feather flock together. The math makes multipliers hard....maybe my friend @Lysander is right, just bump them all up a class.