I consider myself a "new" member that been around long enough to raise an opinion.
From what I've seen, we got some Multi-boxing guilds doing raid, some semi-Multi-boxing and some only-multi-box when needed. The first, I consider a mistake as it will leave the prospect of MMO in general and simply selfish (Put yourself in the spot you fit).
The rotation in general is a good start, but I think were missing two details in it. A: European's (like me) have a very small window to join (low qty of players is challenge). B: Triggers are not used, but forbidden to be done.
Instead of guild-only (or public) rotation, why not set-up hosting-rotation. Each rotation is hosted by the big boys and inform the people when they are planning too kick it of..Maybe time-zone can be considered so those "down-under" will be able to join the fun also..If they cannot raise enough, some will Multi-box.. If stil not possible a tread will be opened on the forum so people can see that if they raise enough PEOPLE, they can do it with 1 restriction...If done on tread-base all players should be listed so all in game can see and evoluate if it was just 2 people or not (which could generate more "hosting-guild" on performance instead of numbers)
Just my 2cent of a not-forum-whore and me understand English, me type English, me not typo-worry