There is a weekend icc25 GDKP that runs on Icecrown. Its not uncommon to walk away with 6k+ at the end of the raid. Its pretty high profile on our server. You cant just get in, there is a waiting list and you have to present the RL with a list of items that you will bid on as well as prove you have the gold etc. Marks and trinkets have had bids in the 15k range.