Then Animal House came out and everybody decided that fraternities with the greatest party in the world and wanted to be just like Bluto. Fraternities now had a waiting list of people wanting to join and they could back to their old selective techniques of carefully screening candidates and blackballing those they didn't want.
The fraternities would maintain files of past exams as well as research papers which could be copied by the fraternity members and thus skate through classes with as little effort as possible, concentrating instead on the social scene, partying, and making social connections.
Fraternities? I'd take a pass. The kind of people attracted to that sort of thing are, well, kind of jerks. Ladies, take note.