I'm now exactly sure if this is completely considered an exploit but i don't have my main account so i've been messing around with macros and for proof check chat that other people can see it. But just click on the quest guy and press macro(spam if possible) and you may spawn more of the quest mob and the dialog like the one in the screen shot repeats and you should be able to do as much as u want as long as u dont get lazy. Could have more potential but decided to share. If this is not the correct place please don't flame just tell me simply and i will move.
Macro:
Picture of proof:Code:/click QuestLogFrameAbandonButton /click StaticPopup1Button1 /script QuestFrameCloseButton:Enable() /click QuestFrameCloseButton /click GossipFrameCloseButton
imgur: the simple image sharer