I agree with you 33grl because the one sorority that doesn't always get the numbers on my campus has the cheapest dues. So in their case, no, more members don't mean cheaper dues. I happen to know my sorority's dues is the highest on campus whereas the others fall in the middle of us and the cheapest.

EDITED TO ADD: Even though my sorority has the correct numbers, etc., if I was in the position of not always getting numbers I'd much rather have quality girls than get numbers. Why you might ask? With a quality, dedicated new member class that's small is much better than a bigger one where there's members that don't participate and give their all and/or drop out.

Don't get me wrong. I love each and every new member that has come into our sorority. There's just been some to drop, etc. I don't have anything against them. Maybe the smaller new member classes have a better advantage because the sisters of that smaller sorority can focus more attention to each new member.