My friend Jeff Goins would be the one to ask about book publishing. That said, in my amateur opinion, the traditional model of book publishing seems to be changing quite a bit. The gate keepers of information don't exist as they once did (or they aren't as valuable). I used to work at the same company as Jon Acuff who basically converted existing blog posts into a book which worked out really well for him. If the content is good, people will pay to have it organized in a book form instead of sifting through a bunch of blog posts to find the thirty you would include in a book.
Nowadays, having a book seems to be more about marketing than making a profit selling the book. If you're an author, you can more easily get speaking gigs and you have a really great business card at networking events ("Here, have a copy of my book"). I've been told I should write a book by various people, but haven't seen the need to yet. I'm fine running my company, I don't need the "author" title as well.
This is very interesting. The traditional publishing avenue stuff is something I was also told by @matrjoschka. It does make sense.
The marketing angle is new information and very interesting. I have no need to speak at events but if I do maybe I'll publish a book!
Thank you for your thoughts. I will publish some of my older work I think :D