art imitates life. there is no right or wrong action really. he has the right to kick you from the guild. you have a right not to be cooperative. i can see his point of view in a way if the guild wants to progress or work as a team but also i can see that the potential to lose 3k on an item isnt worth the guild progression anyways especially if your new and wont get anything from them in the future.
this game has tons of encounters like this everyday and everyone will probably be slighted in some way (some more scandalous than others but still are not bannable). its a crazy world of warcraft