First I will say the obvious. I am not an expert on Manga, but it appears on the surface to just be a comic book styled form, very detailed elegant drawings.
I can see that color would be important but now that we have (besides generic tablets) color eReaders, that should be no problem.
I can see how sometimes there would be the need to put a lot of information/picture detail on a single page, but we have more and more pixels to work with and even larger screens, so that should help.
Anyway, my questions are:
Do we sell the American form comics for and on Kindles?
If not do we expect to sell them like we seem to expect to sell Manga which is the thought I see in this discussion.