It seems it is not unique to diecast model, the pandemic might have something to do with it, looking at that article from the NYT:
(I have a subscription, but I think most should be able to read it as NYT allows you to read a few articles before they ask for your CC details)
Ok, we are not dealing with Porsche 911, but this is just a milder version. Some people are suffering, a few benefit, and a lot are bored, at home with an Internet connection... This is not stimulus money, but the opposite.