> And then of course the "Rigorous Japanese Quality Standards", because obviously QC is better if the factory is located in a country containing people of the Japanese ethnicity compared to other ethnicities.
This has nothing to do with ethnicity, but mostly work ethics and attention to detail. It is true that this may not apply to all Japanese products, but they are regarded as good manufacturers, akin to German products in Europe.
> Topres are expensive because it's a luxury item and they get away with it.
This is true, they are a luxury item. It is also true that they are inherently more durable than other keyboards based on rubber domes, and perhaps not as durable as many other high end mechanical keyboards.
A couple years ago, during one of my trips to Japan, I went to BICamera and tried some Topres. They are built like tanks, no doubt about it, and the feeling of the heavier switches was rather pleasant. I still like my mechanical keyboard better (have a thing for heavier switches), but I cannot deny it was a quite good product. Perhaps not worth $300, but I could see them in the $150 to $200 range.