With the caveat that the prices for these speakers sound insane, even to an audiophile fool like myself....let's be careful about the rationalizations we use.
Dismissing the price of, for instance, the Kharma center channel, shouldn't be done on the basis that "all the center channel does is produce the dialogue." (I'm speaking as someone who works in film sound, here). The center channel is at least as important as the L/Rs because a significant amount of sound effects are produced via the center channel! From the film mixing stage standpoint, tweaks to frequency of individual sounds here and there aside, there is typically no global attenuation of the frequencies going to the center channel (e.g. no one is removing bass from the center of of the movie sound-stage in the center channel). Of course most people use a sub to reproduce the deepest bass frequencies, not only for their center channel but often to help out the L/R etc. But the point is that center channel information is as rich as the L/R info frequency-wise.
FWIW, how the center channel is mixed often depends on the mixer (and often the dialogue mixer at that - they tend to be the "king" at the mixing console). Dialogue mixers are usually looking for dialogue intelligibility and they'll deal with center channel issues in different ways. For instance if you've got a mono clock tick in a scene some dialogue mixers will tell the FX mixer to get it out if the center channel and pan it to a side channel. Others will be fine with it in the center channel but just ask it be lowered in volume, others may not mind the original volume etc. But a lot of effects end up in the center channel (as well as background tracks that spread through L/C/R).
So the center channel tends to have an even harder job to do than the L/Rs insofar as it must simultaneously produce sound effects AND produce most of the dialogue. To ensure the richness of the effects AND the dialogue is reproduced both articulately and naturally - simultaneously from a single mono speaker - is no small task of that mono speaker.
That is of course talking strictly about movie sound track reproduction.