At the expense of your son.
Literally impossible for you not to sit in accusation of other parents, huh? Since words are clearly so confusing the "We" in that statement actually includes my son. Because, as I've tried (though maybe I'll have to get the crayons out to do so) to explain, we actually value his input and allow him to be an active participant in decisions like this. We have a sneaking suspicion that this will allow him to actually become a better decision maker and better equipped to handle challenges as his life goes on.
But, again, please feel free to pretend like you have any idea of what every parent of a child on an elite travel team does.