As with other parts of Greek life, I think anyone trying to make a hard and fast rule having to do with numbers will find themselves disappointed.
Two examples from BU's campus:
My chapter was the largest on campus, and ended up doing quite well (highest grades, most philanthropies, best in sports, awards from IFC every year). It wasn't necessarily because we were the biggest on campus, but that didn't hurt.
On the other hand, when I was a freshman, DTD left campus. At one time, only a couple of years earlier, they had been the largest on campus. Just as quickly, Delts at BU were just a memory.
It can happen both ways; people have to remember that. Large chapters and small chapters can go both ways; you can't judge a chapter by its numbers.
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