The sales pitch was the need to be at the private school in the first place. You will find this out but when the kids get recruited -the teams that will want them will not be the schools they want to attend academically. IAAM is great competition for HS lacrosse but most of the kids on the bench will not see the field in college either so pick the right fit for your child and if it doesnt work out -walk away from lacrosse. Also put that money in a 529 account instead of prep school coffers.
only go to a private prep if you are recruited by the coach. If you are on the coaches wish list then you are probably on varsity as freshmen and getting some playing time from the start... also probably getting a nice break in tuition.