Quota?

[FuzzieAlum]

The problem is, fraternities and sororities are still different. No, girls DON'T want to join a smaller chapter. Girls very much take into account chapter size when they rush. Guys for the most part don't care in the least if they're part of a big or small chapter, but for image-conscious women, it is a very big deal.

Girls want the best standard chapter, whatever the standard is on their campus. If no one has a house, then housing doesn't play a role in rush. But if a chapter is the only unhoused one on campus, see how quickly word gets around that "they're not a real sorority." Or if most chapters have 50 girls, 45 girls is fine. If most chapters have 110, "something must be wrong" with the 45 member chapter.

Obviously, not every single woman feels this way, but enough do that leveling the playing field makes it worth it. Otherwise girls would quickly end up with one or two ridicuously huge chapters on campus. And then you wouldn't have as many houses to choose from for mixers!