I've heard that when construction first came out there was a glitch where by putting items into the treasure chest and doing some kind of trick with a friend(I don't get involved with construction I don't know what happens here) you could get double your item (I think each person ended up with one item). The people who discovered this bought as many rare items as they could and doubled them making unbelievable profits as you could imagine. The glitch needed two people but after it leaked only the owned of the POH was found and banned along with anyone else who knew about the glitch. The discoverers accomplice was never found and could possibly still be playing today.