Instead of thinking of BoE's as items one should think of them as gold. Why does the warrior have priority on 500g over the rogue, who could trade it for some devilsaur pieces? And does this mean, that only warriors can win the lottery in Dire Maul (A Quel'serar drop)?
That being said, I have always waited to see what the rest of the group rolled/agreed upon after the drop of a BoE before rolling myself.