There are already plans to expand the subscriber content, and we are possibly working on a way to include "samples" of the books for subscribers. You must understand though that the books are another product, bought for different distribution means. The chapters for these books however originate in the Wani magazines we're releasing, so this means you are automatically receiving previews of future books we may release.
So you can sort of compare it to tv shows, and dvd season boxsets of said shows. An author (for example Guujira) will
first release a chapter in Comic X-Eros. Then a couple months later, he'll release another chapter. And another. After a year to two years, the publisher takes all these chapters by Gujira and puts them
puts them into a book. Then we license the book if we're interested in publishing it, and you get the option to buy it. As we continue on with the subscriber service, it may get to the point that a whole book has already been published digitally through the magazines. However, for those who really like the author, the books usually have touched up chapters/art, art bonuses, and the pleasure of actually owning the physical book. Gujira's book features one chapter we already have in our subscriber service. Another example of something similar will be the upcoming Napata book.
We began publishing books a good year before we began the subscriber service, and we set out to publish at least one book every month. When the digital version of the book is released, you get a chapter a day until the whole book is released.
Resources are not being pulled from the subscriber service to release books. There are two separate teams, dedicated to working full time to get their projects out. If we were to stop producing the books, the amount of subscriber content would still be just the same. However if it upsets you to see the digital book content on the front page, you have the option of just clicking on the "Magazine" tab to see subscriber only content.
We are planning on expanding the subscriber content, but until then you can maybe try out what other users are doing to justify Fakku spending: sub one month, buy a book the next, sub again, etc. You'll always have access to the full subscriber library every time you sub, so if you wait a month and sub the following, that'll be a good 600+ pages of more content for you to enjoy.