Well, I think it has a little bit to do with sports, assuming he wouldn't hvae been there without being recruited and presumably offered incentives to transfer because he was an athlete.
As far as what happens, I think that's up in the air. You'd think parents wouldn't keep paying tuition like that just to have the school recruit over their kids. But that's basically the dynamic that has thrived at MRA for decades, so I don't think it's obvious it can't thrive at JA. On the other hand, I think MRA was always significantly cheaper (and I presume still is?) and I don't think ever pretended they were providing a premier educational opportunity. If you ask somebody why they are paying full tuition to have other students recruited over their child, I guess the answer would be it's still cheaper than they'd pay at Prep or JA, so public school where they also won't likely be playing, or Canton or Tri-County.
For JA, the question of why are you paying $20k a year to have the school recruit kids over your child and get discounted (or basically free) tuition, it's a lot harder to come up with a justification. If you want the education, St. Andrews offers a better reputation and prep offers the same.
I'm obviously in the minority, but it's crazy to me that giving out scholarships to a an expensive private high school to play sports isn't an obviously dumb idea. But it's apparently not and maybe it will actually help JA to start winning more championships, but I could give zero ***** about whether my kids' school is competitive in sports and would gladly have them suck if it took the number of their classmates that will attempt armed robbery from 1 to 0.