I work with a small boutique publishing house. The Editor in Chief is a scholar and psychotherapist, and several of the authors have published books on psychotherapy or related topics. You have made some sweeping generalizations about publishing versus self-publishing. Your publisher, especially one that understands the subject of your book, can be the best investment you make in the process. Don't short change yourself in what can be a representation of your finest work and of great value to you.