It's very unfortunate that it isn't as popular as other manga/anime. What everyone said above this post is spot on, and it sucks.
However, I do like the fact that Guyver isn't exploited like Bayformers or the new TMNT. Sure, it would reach a much wider audience, but on the other hand, there is so much room for f**k ups, which I don't know if I or we could handle.
I love the story, the characters, the setting, the concept etc... And I very much enjoy the monthly chapters and am always looking forward to reading them.
I dunno. I'm drunk, and I may or may not be making sense. But as long as Takaya lives, Guyver lives. And I am very happy with that, at least.