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Blizzard really should make killing one of the opposite factions leaders have some great reward.
Whatever, a drop, a huge amount of honor, or even a token you couldnt get anywhere else which you turned in for something like a quest or whatnot.
I know i always love to see my city being attacked or attack an opposing city, it really mixes things up and seems to put the War back in Warcraft.
hell if it was a drop they could make it so that stuff only dropped if no one in your raid had killed that particular leader that week (so that the city wouldnt just be infested)
just a thought