Sometimes you just have to live and learn. I rushed my sophomore year, and did not receive any bids. Rush is pretty competitive at my school, and even though I told people I was a sophomore I was really classified as a junior due to the numerous credits I gained from being a music ed major. So I was cut pretty hard. I didn't know how to "play the game" as someone said earlier, and I didn't even know that someone could write a rec for you until I came across GC. If it were any other reason besides those (such as my personality or what not) then I certainly don't know of any, but then again I don't need to know at this point.
But hey, a new sorority is colonizing this fall, and I'm very excited about it. Getting cut from rush is hard, but I've evaluated the situation and decided to take advantage of this opportunity to become a founding member of a wonderful organization.