Whoops, I just slipped on a worm
I can see both points of view. The guys' rush is so laid back I can see where sorority rush would just seem mind boggling! And in some cases, I think it wouldn't be a bad thing to relax some of the rules. We have heard some formal rush horror stories on this board, and I'm sure there are some women out there who would be assets to any house that never go Greek because they just don't want to put up with the phoniness and stress of formal rush.
But on the other side of the coin, I think it would do the guys good to have to visit every fraternity at least once. I've seen quite a few guys who end up hanging out with another fraternity more than their own, probably because they never bothered to check out enough alternatives during rush.
What SoCal said about the difference between the purposes of NPC and NIC also has something to do with it.