S90V blade, titanium framelock with milled "webbed" pockets for lightening, solid carbon fiber presentation side with a nested steel liner, with contouring and the "drunken" wavy milled grooves all over the surface of both scales... I'd say the materials and especially all the machining required is enough to justify the cost.
I agree with those saying the quality is "only" as good as a ZT...limited edition, that is, like the 0777m390 or 0454 (the only ones I've handled). Those also had intricate milled lines all over the handles and cost about 500 dollars. Based on that I have no problem with the pricing of the Drunken and don't think it's an outrageous asking price.