Rick, from having attended many swim meets at Triangle Aquatics Center in Cary watching my sons compete representing Enloe and Cardinal Gibbons, I think an important and influencial reason why these schools and those like them have greater success than other schools in swimming, and most probably the same for tennis and golfing, is that their kids have parents willing and able to afford lessions away from school, and/or dedicate an hour to hour and a half, two to four times a week for training, at somewhere nice and fairly near to where they live, and have parents willing to run them to and from training, and be involved in these/their sport. Nothing to do with schools, and whether there are considered affuent or not.