I don't think that would be too uncommon. Especially for a guild that has progressed well. I'm also in a top 10 raiding guild on Dalaran, we just downed Mother last week. My guildees are very supportive of my multibox team and often offer to assist. I would imagine that when I reach 70 I would be able to do some kara runs. They are bugging me like mad to ding 70 for EOTS and AV. Every time they run into a 5-box shammy gchat goes nuts!