all sororites not present

Why isn't the sororities and the fraternities from the National Panhellenic council and the Multicultural Greek Council included? Just because they don't have houses? Is that all greek life is about? Hanging in your houses, getting drunk and laid? Whatever happened to building sisterhood and brotherhood? The true purpose of the Greek System?y I am a member of a non-IFC/Panhellenic sorority and the fact that my sorority wasn't on the list annoyed me. We do so much around campus. We do a ton of philanthropy things and organise a bunch of events. I strongly suggest that the rest of the sororities and Fraternities be added. There is a list of the ones that are missing.
1) Alpha Phi Alpha Fraternity
2)Omega Psi Phi Fraternity
3)Delta SIgma Theta Sorority
4)Zeta Phi Beta
5)Omega Delta Phi Fraternity
6)Sigma Lambda Alpha Sorority
7)Lambda Theta Alpha Sorority
8)Kappa Lambda Delta Sorority
9)Lambda Theta Phi Sorority
10)Phi Mu Alpha Sinfonia