Some Jesuit schools do have Greek life, some don’t. Georgetown does, BC doesn’t.
Gettysburg is a small town (touristy stuff aside). The students have to make their own entertainment and it’s a couple of hours to Baltimore or Philly. The Greek and sports give them structure to do that.
I asked my daughter and her boyfriend if they ever had ‘school envy’ when they traveled to other schools to play their sport if they wished they’d gone to another school either for the sports or academics. Their school was in a small city but close enough to Orlando or Miami to go to concerts or events, and of course they had the beach. Her boyfriend made it clear that many of the towns they went to had nothing for students, not even a pizza place that stayed open past 7 on a Saturday night.