Why is Rush so Cut-throat on the Sororities' End at Big Greek Schools?

[DGMarie]

I think it is interesting to understand what makes a chapter super at one school and not worth pledging at another. In other words, is it consistant that top sorority ABC is like THIS (rich, skinny, gorgeous) and bottom sorority CDE is like THAT (poor, fat, ugly) (I am grossly generalizing) and this pretty much determines the pecking order no matter the school or the GLO.

Are the summations above from Texas Monthly true to form? Of course, I'd personally like to know how DG stands in that pecking order (or maybe not?).