Response to Blog: Purpose of joining Frats/and Sorors

This is a response to Becky's question what is the purpose of joining a Fraternty / Sorority. Too be honest I really do not know.  I see these girls walking around like zombies, no makeup, no jewlery and bags that go from their eyes to the ground. They walk slow and can only eat alone or with other pledges. They ge tyelled at, degraded and other things that I have heard. They trick into joining with being nice to you, but as the weeks go on, they turn into monsters. You get no sleep, you get yelled at and this is all because they choose to join.
The only reason I can think of that would make someone want to join is either the fact that they have low self esteem or they feel like they don't belong. They want to be wanted and will do ANYTHING it takes to be loved and apart of a group which I feel is not OK. Belonging to a group shouldn't mean that I have to be physically a mentally tested, but we can't blame the sororities because it is just another social structure/category in life. It you really think about it like is categorized beyond measures. To be an RA or Orientation leader you have to have a certain GPA for them to either consider you and then you are put through process to prove that you can be apart of a team and that you can excel. Same in the job world, you have to prove yourself to people who critique and criticize you and prove that you can "make it." So my question is, is there anything that someone can be apart of without having to prove themselves?