What I said is totally unrelated to your project though: 1) As you said you already have an established community and contributors and 2) your project is entirely different from mine: As you said you support 50+ fanfiction sites and you are developing a plugin for Calibre, meaning it's not limited to the Kindle or even E-Book readers.
Last but not least "more interest" wasn't the only reason I listed when I made the suggestion. But well, I can't force you to anything you don't want to do and it seems pretty clear that you've already made up your mind and that my arguments won't change that. Good luck and I wish you all the best with your continued development then.
Somewhat offtopic: I actually am keeping a private copy of this repository with a "cryzed" branch on Bitbucket with the changes I suggested months ago for the design and the parsing of fanfiction.net and fictionpress.com stories -- so personally I am very happy now with how the plugin behaves and I was able to obsolete my
own solution in favor for it, thanks for your hard work; I really appreciate it.