I just sold a Nameless Hat & Poncho to someone via forums. I really wanted to keep the set together, so i could not list them in the Auction House. Sometimes people want to sell sets of things. Perhaps there should be a category for this in the Auction House.
Sometime I want to sell groups of materials but it only allows you to sell 1 kind. Yes, they should make a section for groups of things. It's annoying always having to make four bids of a set, like Jelly armour and shield. Nice idea man!