I agree with my brothers on this one. While I can't speak for the frat, I think those were good points...if you've never experienced something like this @ your chapter, it's hard to understand. A lot of Gamma Sigs don't participate in the lines and so on, but they also understand (I hope anyway!) that it's something that other Gamma Sigs do.
I'm a #7 for life
So who ever is reppin for 7, no matter what the org, is cool with me. Same thing with when you crossed/got initiated...I was made in Spring '98 so I have love for my "sands", those who also were made in Spring '98. It's all in fun, really, and what Buffalo Soldier said, it's a way to identify with your brothers/sisters.
And, you may want to research a little more, too...because SAI does the same thing
Always in Service...