In many of those schools the "trivia" includes beautiful houses with fulltime cleaning staffs, cooks, and waiters.
As bizarre as this sounds to me (and to you), when you shake the costs out, it's probably no higher than Ima Independent doing the following:
-renting a student apartment
-eating out constantly because she doesn't cook
-driving from place to place to see her friends because they live faraway at the other end of campus/town
-constantly calling cabs to get to nightspots
As far as clothing, shoes, bags...that has NOTHING to do with sorority membership. The "right bag" etc issue is EVERYWHERE. I'm sure that right now, there is a girl ready to enter some enlightened place like
Juniata, standing in Macy's telling her mom that IF SHE DOES NOT HAVE A COACH WRISTLET SHE WILL DIE, ABSOLUTELY DIE. Hell, there's probably some girl getting ready to go to CCAC saying the same thing.