I beg to differ sir, no assumptions at all....I know guys that can't afford a truck payment yet have a 10k rifle in their possession for hunting. In the African Safari Magazine Rifle section of GI there is enormous amount of safari type 37-40-Something caliber rifles,.....by far more popular than the 500's. 500's imo are an exotic and not many guys will ever be in the market for one much less ever intend to use one. That being said here is what I see on the 1st two pages of that section, all very expensive rifles:
Rigby-34
HH-3
G & H-2
Breeding-2
Prechtl-2
Jeffery-4
Full Custom Makers-8
Gibbs-1
All of these are ready to go.
Your example of Heym is exactly correct, they would be an example of a company that is "under producing" on purpose, pretty much only building to order, probably a really smart way to do it. When it comes to doubles, there are far less units in total to begin with,...and the English builders are 2-3 years behind. In my mind those guns are all going to the upper crust of what we are talking about here....similar to the 500's.....small, small, small, market. This middle market is what I find fascinating.