Anime is an extremely lucrative market, and Westerners spend an absurd amount of money on it, with Hollywood missing out. It's not because it's Japanese, or its weirder quirks, it's just because Japan is making it and Hollywood isn't, because Hollywood is institutionally incapable of believing people want (a) weird fantasy (b) that takes itself seriously (c) in quantity over quality, or even that adult media can be animated in the first place.

I really don't think it's that hard to imagine the same is true of manga vs books. The manga section at any serious bookstore is the size of 3-4 other sections put together, and it isn't for no reason. Even if you assume it's a graphic-novel-specific preference, for every one Western hit like Bone, there's fifty more equally massive hits out of Japan, because they simply try more often. Authors making weird stuff in the West are unable to enter traditional publishing (with the industry learning the exact wrong thing from the YA phenomenon) and frequently settle for a web serial + Patreon model, whereas if they were in Japan there's a well established light novel to manga to anime to movie pipeline.