Today at church, I was talking with a senior who's a Greek at one of Georgia's universities. I asked her how many of her original pledge class were still in her sorority. To my shock, she said 8 of 55. She said that there wasn't any mass desistering or anything--a few transferred, a few dropped out of college, but most just drifted away.
I was shocked because this student is in an extremely strong group on a very Greek campus. Her friend assured me that it's not just the first girl's group--that her group (also strong) has 9 left of 55.
I come from large SEC schools where it's such a big deal to get into most groups that you don't just blow it off or quit paying your dues or decide that 5 hours a month of service are too much. If you stay in school, you stay Greek and most pledge classes graduate relatively intact.
What's the norm at your school?