quite honestly i'm amazed its not higher. if you've ever tried to mine these, you'll get roughly 1 hit in a normal day. i've been mining for years, and its about 150 broken pickaxes, or 6 solid hours.
If you are going to drastically undercut something as fast selling as this, try shouting to sell it as cheap as you are going to on the AH. Someone will buy it from you and you won't create a domino effect on pricing. I do it all the time when there are a vast amount of k.ores and I want gil quickly. Not to mention you save yourself the AH tax!