This generalization is very, very wrong. I can tell you, from my personal college network, many students had monetary constraints coming in, and many certainly had monetary constraints coming out. Some of that was choice of career path; some was not.
I don’t understand how someone coming out of Brown or Yale would have constraints coming out. Their degree is basically free, basically any degree can get them an analyst gig on Wall Street if they so choose, and at worst they can go down the law school path.
You don’t become one of the wealthy just by going to school with them. You’re still an outsider, lesser, just one of the little people, not their sort.
As someone too inferior to get into one it sure doesn’t seem that way