[IUHoosiergirl88]

Not necessarily. It could be a number of factors

-the school could just be not very interested in Greek life (but since you have 15 fraternity chapters, that means there is a pretty decent amount of interest)
-the chapters could be limited for some physical reason (meeting room size, chapter house size, etc.)

Do you know the difference between types of fraternities? These could be professional or non-NIC fraternities, and that could explain their year-round recruitment. It just smells fishy to me if a school has a formal pledging process in the fall and spring but also recruits year-round