The market is going to decide the fate of everything mentioned here.
Over the years I have done a lot of business with The Modelhaus,with the intent of building the kits, and using everything else to repair old builds that I have bought over the years. Unfortunately, I will have to sell off some things, as there is no way that I can build them in my lifetime. I would not have bought items just for speculation of future sales, but some folks have, and the prices are being driven up because some folks can afford to pay a higher price than some of us.
I have been trying to get a particular model or parts of itfor the past three months on EBay and other places, but every one of them, even glue bombs have been bid high, and it is not particularly accurate in the first place.
I say do a few castings of the project, and let the market decide. I may buy one if I can afford it.