Ive had this exact same thought process before. Except with the vouchers aspect. I get the idea behind trading using a vendor, but i still at there should just be an option. While i completely agree on the "rarity for same rarity" part, i still think some items shouldn't be able to be traded. Raid gear more than anything else. Id happily trade my extra invective a for a gjallahorn or hawkmoon since one of my friends had 2 of each and still hasnt gotten an invective bounty