[AOII Angel]

I think it has more to do with the Greek Advisor and the environment fostered by his/her office. If recruitment violations, non-Panhellenic behavior, etc is tolerated, this breeds the kind of experience you are talking about regardless of the number of organizations on the campus. Advisors/Greek Life offices that work to minimize these negative influences and maximize events that make groups work together help the environment. In the end, though, you'll never totally get rid of a feeling of competition when you compete for the same girls every year during recruitment.