I don’t think you’re going to get good answers here. Very, very few people earn over a half million dollars a year and want to send their minor child to another state for that majority of the year. You can clearly afford $70k tuition, so if you think it’s worth it and your son wants to go, who are we to say otherwise? Obviously the frugal option would be to send your son to the best public high school that will take him and not spend the median household income for NYC on his schooling every year.