I boosted 2 teams to thru BC before Cata. The Wrath and BC questing seems so very slow now. I am doing fewer 85 dungeons and concentrate on leveling my other teams. Wowwiki say the formula is Guild exp = Quest exp/4. I don't know if its worth questing. Getting one team thru the Cata zones gave me one guild level.

I have my own guild, so I'll never be able to do some achievements and buy the items. The perks are, well, nice perks.