It's beatable if you don't live in the US.
I bet the MW in French are cheaper for me than if I would buy the US all in one version. The French one only did cost me around 6$ per volume, that's the only reason I bought them.
Kirihito in French was a lot more expensive than the Vertical version that's true. But therefor they're unflipped.
But still, the vertical versions are great and I would buy them too if I wouldn't have a french comic shop near me.