The latest big patch in WoW (3.2) implemented a change which has interesting (albeit probably small) virtual economic implications:
Players will now be able to trade soulbound items with other raid or group members that were eligible for the loot. This system will work like the Item Buy Back system and allow 2 hours for players to trade an item after it has been looted. Players who choose to enchant or add gems to the item will get one last confirmation before losing the ability to trade the item.
Prior to this, most of the better items looted from dungeons were bound on pickup, meaning the item never became part of the trade economy of the game. With the new change, you can actually loot items and barter on the item after returning from the dungeon.
From economic perspective this is a small thing, but I’m sure some users will start to take advantage of this at least in PUGs that use Need Before Greed, as you can now not only ninjaloot the item, but also blackmail someone who’d wanted the drop for more than the resale value of the item. Of course that won’t win you any friends but I can’t see that stopping people from abusing the system.