Because it´s the first toy of its kind, because it´s as tall as a 1/48 (but the VB-6 has more volume thus more material used), because the transformation is more complicated, because it has a lot of parts...
Let me ad that we get a robot, a destoid monster and a shuttle, 3 in 1 (with the VF 1 series we get a plane and a robot ´cause gerwalk is a combination of the other two)
...Because all that, it will be more expensive than a non FP 1/48 valk.
Disclaimer: all of the above will be the reasoning of Yamato (I share some of those thoughts)
My guess is that it will cost a minimum of U$S 180 if not more.
Note: the above price is not what I´m willing to pay, it´s what I firmly believe Yamato will charge us.
I suck, I want the König Monster so...