I'd say it's a combination of pricing, marketing and port quality.
Xseeds problem is, that (as much as I like them as a company and their games) they suck ass at marketing anything on PC.
Xanadu Next is a fucking fantastic game, but barely anyone outside of GAF (and that's mostly because SteamGAF has been shilling hard since its release) has even heard of the game.
No matter how good a game is, it doesn't mean jackshit if no one knows it exists.
Also I wouldn't say that everyone on PC expects to 'fly business class'.
If we follow that analogy, I would say most are just fine with economy class, but many japanese ports don't even reach that - it's like being a stowaway in the cargo bay while having to pay first class price. (looking at you Koei).
...Well that reads kind of weird, but you get the gist, haha.