Sure, they can decide if the think the deal is worth it to them or not, but they probably aren't the one with the most information about the training spend and value of the ISA.
It doesn't matter particularly to the student, but there is some utility, even from the outside, in estimating how much direct value a school provides and how much of a matchmaking service it provides. Your whole premise is that universities mostly provide matchmaking!
A Stanford grad doesn’t know what the marginal cost of their enrollment is.