The trouble is, how to market it, since the market is saturated with so many books that are self-published. I am hoping to eventually get a deal with a proper publisher, to bring the prices down (Blurb really make most of the profits from one's efforts!) and to enjoy wider distribution.
If you go with a commercial publisher, THEY will make the most profits off your book as well.
The only way for YOU to make the most, is for you to publish it yourself - not with a service like Blurb, but find a good book printer, and get a number of copies printed yourself. (Generally between 1000 & 5000 copies).
It costs a lot, but it is the best way for you to market your book and make the most profit doing it.
I've studied self-publishing extensively, and self-published some wall calendars. I haven't done a book yet only because I don't have a body of work that yet that holds together and fits a book format. But when I do, I will definately self-publish. And in fact, there are MANY big name photographers (in fact, most) who are self-publishing themselves, when it looks like they are being published by commercial publishers, but they create an imprint to publish under, so it doesn't look like they are self-publishing.
Self-publishing is the best deal for photographers for many reasons, not just profits. But you have to also understand how to promote your book once it's printed. I don't know where you're located, but I'd suggest you take a good college level class on self-publishing photography books.