The answer: sometimes you have a book you believe in that "falls between the cracks" of traditional publishing, and you want to give it a chance. My POD book is doing quite well -- getting good reviews (see, and has sold over 800 copies so far. I'm doing the marketing myself, to specialty markets to which I have access. Published friends tell me their publishers don't do much for them and lose interest quickly after the book is out, and some are considering POD next time. Sure, I hope to get my next book published by a regular publishing house, but I'm not sorry I took the initiative and did POD.