why so many drops?

Most ppl are chosen based on shallow reasons which makes it difficult to sustain a group of women who actually like each other. Also the dues aren't abysmal, not everyone wants to spend a bunch of extra money for four years. I have personally stayed in my sorority even as a senior because i rushed as a sophomore. I'm also closer to the grade below me. Oh and some people are just more invested in post college life than sororities.

While a lot of people drop, way more stay in until the end and love it. As far as girls in my house most of the ones I know who dropped because of money, transfering, or because they were kicked out due to grades/ breaking serious rules. I know very few who dropped because they didnt like the house.
However, in houses with worse sisterhoods there are definitely girls who drop because of cliques or they dont feel like they belong

There's a natural attrition that happens. If you could look at the entire size of a freshman class and track it to senior year, you'd see it shrink to almost half.
Lots of reasons - people transfer, drop out of school, take a couple of years off. In sororities, some girls decide that a sorority is not for them, some get married and go alum, some take early alum status (if that's allowed).
The reasons are as individual as the people.
I've been an alum now for many years. We recently looked around at our alum group meeting and realized that almost every one of us had been alumnae members much longer than we were collegiate members, and that we have strong relationships among our members - we've been through marriages, babies, divorces, remarriages, new careers, retirements, grandchildren together.
That's one of the most beautiful aspects of sorority membership, and something that doesn't even occur to you when you're in college!

As you gett past the freshman need to meet people and get involved at a new place, devolop friends and connection and have places to go and socialize outside the house, the expense of membershio doesn't always seem to be a "good value".

Even for people that can afford it, it can become a "value call" whether to spend thousands of dollars for something that seems superfluous.

True, there are houses that attract more of the "my house is the center of my universe" types, which some call strong sisterhood, who retain more upperclassmen.

Other houses, with more independent thinkers, who are called poor aiterhoods by some, have higher upperclassmen drop rates. \n\n\n\n\n

Agree with most of these responses.

it happens at every chapter, at every school. its part of the sorority life