I guess it goes to show that one chapter of a sorority can be considered the cream of the crop/elite sorority to be in, but at another campus they may not be nearly as successful.
This exact thing happened when I was an undergraduate at a popular southern school. There was a sorority on campus that had been there since sororities were allowed to colonize but they closed in the 90's due to continued low numbers. This is one of the same sororities that is considered "Old Row" in Alabama.
I understand having pride in your sorority, but when it all boils down to it, does being in a "top tier" sorority on campus really have any impact in your life after college? It's not going to help you get a better interest rate on your mortgage, boost your credit rating, isn't going to make your kids any smarter, make your marriage happier and it's not going to make you become a better person. To be honest, if it does matter to someone what tier of sorority you were in 5, 10 or 15 years out of college, than that person has their priorities really skewed...I don't think that St. Peter will be checking sorority membership lists at the gates to the great thereafter!