Additionally, you have to be careful how the rankings source the salary number. Obviously distribution of majors at different schools is a big factor, but on top of that many rankings look at earnings within 5 years of graduation. If your program tends to produce doctors, lawyers, etc. (in particular when they choose to further specialize) the salary 5 years after graduation is obviously not very good, but lifetime earning likely is. My guess is if you take a random Ivy and a random state school, the Ivy is going to have a notably higher percentage that pursues a graduate degree, which means those 5 year numbers probably underrate the Ivy.