Kind of sad to be so good you miss out on the high school and college team experience. But it makes solid financial sense, depending on the numbers. I suppose as an 800 specialist he probably doesn't care too much for cross country, and that's where most runners would say the team experience is best.
How do high school athletic regulations work in this situation? He can't compete in track. What if he were also a swimmer - could he still compete in high school swimming events after going pro as a track athlete? Or is everything off limits? If swimming were okay, what about cross country? Probably way too close to track (even for an 800 specialist).