Let me put this in terms that you can perhaps understand, Dave.
Ten years ago, Ted Savas sent me a book manuscript to review. It had been submitted to him by its author, and Ted didn't know enough about the content to feel comfortable. I read the thing. I then told him that he would damage his hard-earned reputation for publishing outstanding books if he published this pile of ****. Fortunately, he listened to me. The author immediately turned around the self-published this thing because his ego needed him to do so. The book is terrible. It was imposed on the public because the author's ego demanded it. It's not worthy of publication. It's not worth the paper it's printed on. But it's out there. And it shouldn't be.
Eric Jacobsen publishes his own stuff because he wants to control the process. Eric does great work and he has managed to create good looking books. His work is definitely worthwhile and would have been published by a commercial publisher had Eric wanted to go that route.
Call me a snob if you like. But I believe that only worthwhile books should be published because I believe that bad books filled with bad information and poor writing should not be imposed upon the public, particularly if the public is going to believe fraudulent information presented as the truth--and commercial publishers sometimes get suckered into publishing fraudulent material too (see Carhart, Tom for proof positive).