It looks a stunning model. I only wish I could afford a GNR one!
Without going off topic, the cost is a big consideration. As Ian states, there is a valid argument to state that for a model of this quality and detail, along with I'm sure the not inconsiderable R&D costs, it is to be expected that an appropriately high price is attached.
My only hope is that these prices don't become the norm for 'standard' models as it will likely impact on the popularity of the hobby in my view. I once harboured dreams of modelling modern tin plate O gauge only to realise it was out of my league finance wise. That's why I'm all in favour of Hornby's railroad approach which whilst producing cheaper models affords the ability for novice modellers such as myself to have a bash at detailing up, modifying and to build a decent collection of stock up.
Ultimately though, people are free to spend their money on what they want. I look forward to seeing some videos of these in action once released.
Greg