Yeah, doesn't everyone want to be in the most popular group, because that's what sisterhood is all about. Ummmhmmm...cuz you got to spend so much time talking to them and getting to know them.
The number of women going through informal is immaterial. What matters is the number of spots open in each group, which is determined by chapter total. If chapter total is 60 and the chapter you want has 59 members, they can only offer 1 bid. That means you have to beat out every other girl going through...all the roommates of recently initiated members, BFFs that go out with sisters every Friday night, etc. you've had your little mind closed from the beginning, so don't be upset that they won't change their minds either.