overread: The other factor is likely translation which for Japanese to English and vis versa (as well as other languages) introduces a lot of complexity and thus also increased costs
bansama: Two things:
1 - SEGA do support consoles. So a lot of games they release on the PC ROW get released on console only here -- eventually.
2 - The Japanese PC market is rather unique in that it is fully prepared to play in English, so Japanese translations are more a bonus than expected. In fact many "localised" retail PC releases were simply a translated manual.
It may make sense to not translate and distribute a Japanese game to the rest of the world, as it does take effort and it might be not worth it (although I doubt a DD only version wouldn't pay off, but it's not like I know hard facts). It doesn't make sense to not release a game on an online platform because Japanese people will be able to buy them. It costs literally nothing and is just free money for them. I can understand not releasing a retail version because they think it won't do well, but not pairing with GOG due to that reason? It's so dumb I must be missing something. Same for having localized console versions and an international PC version, yet not allowing for the PC version to be sold. Absurd.
I seriously feel for you not having the chance to buy the total war franchise, which ironically had it's first (and latest) installement set in Japan. It's so sad that I would mail you my retail copy of "shogun: Total War" if it wasn't in Spanish. At least I think it was.
overread: Ahh the point on being willing to play English is very interesting. I know that many countries do have english as a main second language (second language studies in the UK are, generally not that strong overall) even though they prefer more localised translation for games and other products.
Believe, in places such as Spain the idea of "English as second language" is much overrated. And people still play videogames in English when no other choice is given, but the localization usually means a bonus to sales. Which is why they do it, I suppose. I suspect Japan to be a similar case, I got a feeling 2nd language wise they were generally on par with, maybe a bit above, Spain. Heck, the main reason I originally learned English was to understand my computer!