darksabbath
Dalayan Master
I could withstand a stamina loss instead. No stances worth using, usually, that use stamina anyways.
Buff Duration = 10% of normal time if amount of experience gained in the past month on the toon is less then 2 million xp (a touch longer 2x 2 hour group at Citadel? idk the real numbers). Then have it graduated up based on how much xp gained in the past month. Make it reasonable for casual toons to have full duration, but make it a pain to keep old toons around just for buffs.
This at least gets rid of the 4x enchanters/shamans/clerics/mages/druids people have if their guild is more than a year old. You may also want to nerf sta regen along the same lines to make it unattractive to keep melee bots around as well.