What really p***es me off about this sort of pricing, is that the prices are inflated due to collectors - people who have absolutely no intention of building the kit(s) in question, or reading and referring to a particular book; they just want it in their 'collection', knowing the value will (probably) rise, and they can smuggly say "I've got that!"
This means there are probably, for example, 100 Airboxevell Messfire BW 209 kits, which real modellers want to build, sitting in a cupboard with the boxes unopened, just because some speculating bunch of numpties bought them for 'collections'. Grrrrr!!