I have no idea why this is favorite one for some people, but seeing an enhancement shaman with sulfuras was a very rare sight, because shamans are healers and unless you are raidleader, no one would give you this quest...
You would see shamans wearing AQ mallet, or unstoppable force, or the-one-that-knockbacks-everyone, or pvp one, or some sick low level fuck with 8 second stun one way more often for literally the same result.
I for one never saw a shaman wearing sulfuras, and if i would see one i would slap my face really hard in a facepalm.