Eavesdroppers?

Have you ever noticed that the npc's in WoW seem to interact with you in more ways than one, ie the normal responding when you right-click on them.

Take a look at this screenshot from a guildchat conversation:


Doesn't it seem just like that Goblin Commoner is responding to me talking about excess gold lying around? It's really good timing, is it really a coincidence?

Is Blizzard monitoring our conversations and making the npc's respond to it? Or am I being paranoid? And btw no thanks, I am not cold, I don't need that extra jacket, and it doesn't really look very comfortable anyways with all those straps on it, and why are you coming at me with that needle thingy, aaaargh get off me get off me, get aaaaargh....