I think others here have already explained it well enough, but I'll just confirm that we don't want to interfere with prices on the Auction House. Players are free to attempt to sell items at the price they feel it is worth :-)

As a part of the on-going evaluation of Looking For Raid and the loot system, we have recently implemented a change to the Looking For Raid Need Plus system. Weapons, trinkets, rings, neck pieces, shields, offhand items, and the Robe of Glowing Stone are now class-restricted to their intended users. With the speed at which a Raid Finder group moves through a zone, we've found that it makes it challenging for players to evaluate loot decisions – by class restricting these items, we hope that the natural behavior will have a more positive set of results for everyone involved. This change will not apply to normal or heroic raid or dungeon loot rules.

Raid Finder and Need Plus are both very new systems, and we're working to iterate on these systems rapidly to ensure that everyone has the best possible experience as we learn more about how players are using the system. Please keep in mind that this system is not considered complete and we have further plans to improve upon it within Mists of Pandaria.

If you looted an item from Looking for Raid which replaced another and you need Game Master assistance to recover your old item, please place a petition with the new item name, that you can no longer use it - and the old item name you need restored. For more information on the affected items, please visit the Customer Support forums here- http://us.battle.net/wow/en/forum/topic/3729953854#1

We apologize for the inconvenienc