fairness in price is relative.. you have to remember that the Urishi finish on the cups of the TH900 alone is extremely valuable - some "googling" will show you small pens or a single wine glass with the same Urishi finish go at least $500+.
I agree that just for the audio quality and build $1400 may be reasonable (many agree its one of the best dynamic headphones in current production) add the valuable and beautiful Urishi finished cups and you are looking at $2000+. To me its fair, its a work of art both in terms of audio and visual beauty. For those who think the pricing is too steep the TH600s may be closer to the $1k margin and will forgo the Urishi coating/wood cups for matte metal cups (at least as far as the prototype shows).
To be honest the Aduiotechnica W3000 ANV look much better (beautiful) and more expensive than even these Urishi-finished headphones. While still costing noticeably less.