What makes Ivy grads more successful?

As a Harvard grad, I’d say the basic premise of the question is dubious. But the real question behind the question surely is why do Ivy’s have this special mystique and assuming it is true why? I think most of us are saying that while they are great schools, with excellent networking possibilities, that there is a limit to what a school can do to make you “successful” - however you decide to define the word.