We don't publish anything we have not originated ourselves. This is a business decision that keeps the size of our company manageable and our publishing focused on the areas that we are interested in serving. We have very limited resources and must consequently avoid committing ourselves beyond that which our team can manage.
There are a great many do-it-yourself and assisted publishing options available via the internet nowadays. Making a book (perhaps just a Kindle book initially) is very straight forward. Publishing a book is not an issue anymore. The problem is marketing and distribution. Typically the marketing of books is falling more and more to the author. Even large traditional publishers are going to want to know more about your marketing skills and social media savvy/numbers than they are about your writing skills. If you know who your audience is and how to reach them, then you have the potential for a financially viable project - whether self-published or via a publishing company.