I think the dude from the other thread hit the nail on the head
Quote (bnetplayer1858 @ Nov 29 2012 03:04p)
It could also be a trading technique, similar to pump n dump, called trapping or sometimes buzzsawing.
You market order into all the liquidity on one side and then populate it with your own liquidity at the top end of the spread, or peg the price at some arbitrary value as long as you can consistently keep other people's liquidity out. It is a form of market manipulation that is easy to perform when you hold a decent percentage of the available capital.
It's amazing this hasn't been done until now in HC. Even though Blizz has stated they will ban for this (Blizz calls it "investment" lawl?) but we all know Blizz is powerless. If this is actually what's happening it would mean someone has been crafting 1h's at the same time buying up all high dps dual crit weapons, hoping to set a precedence for these types of prices.