Bit pricey, don'tya think? 
This whole thing already turned into a 15-page discussion over at ANN.
Here's what it boils down to:
The price for this boxset is so high because it is a big premium release. This release, as by Aniplex' train of thought, is only meant for the kind of fan who is willing to pay the extra mile to obtain it. The kind of fan who thinks the series is worth so much, for the collectors out there, not the "casual Anime buyer" who already complains if a complete season set costs more than 60 bucks etc. Hence, you can be pretty sure that this release only has a pretty limited number of copies. The Kara no Kyoukai BD Boxset was similiarily priced and sold-out the day it was officially released at RightStuf. This is a collector's item and hence it is priced the way it is. In the eyes of Aniplex, if it's too expensive, that's too bad for you.
And I somewhat doubt there's going to be a more "standardized" release of this for the US either. I mean, Kara no Kyoukai didn't get another release for the US afterwards, no DVD version, no single BD release, nothing. It's buy it or leave it.
As for me, I am somewhat enticed to buy this, but I'm not sure yet. For one, March is already a pretty expensive month for me given my purchases of games, DVDs and figures and second of all, I haven't found a good store with a somewhat lower price for it yet. So far, RightStuf seems to be the least expensive offer I've managed to find, but the issue is that RightStuf only allows for international customers to pay via credit card, something I do not have. Which pretty much only leaves me with options like CD Japan or AmiAmi.