Honestly... because I rushed before I knew the difference.

I'm in a "professional" GLO that has a focus on music.... and yet I have absolutely no interest/involvement in music. When I rushed, I thought all sororities were the same, and DO just happened to be the one that had rush first.

I'm still glad I joined, because I love my sisters, but if I had the chance to do it over again, I would have gone NPC.