I don’t think you can make any generalizations based on cost. I know first hand schools that aren’t on this list that feel way more “country club-ish” than some of these schools. Throw in greek life and you can get some very polarized socioeconomic distribution at many schools.
I have to admit to being surprised to see some schools on this list - Kenyon for example, which has a 30% acceptance rate and is in a rural part of OH that doesn’t have a high cost of living.