Hi Les, I just bought your book, so I guess I'm still at the stage of How rather than Why...
I must say in the first place that the reason why I came/found APUG was that I needed more knowledge on the analog photographical processes, so discussing the How was main reason Why I'm here. I believe this is also the case for many others, but I won't generalize.
The process is part of the reason why I wanted to make photography. I love manual labor, hand-to-eye interactions, and while this is not woodworking, photo is still relying on my servo-motor centers enough to be considered manual. But the other Why behind doing photography in and out of itself, regardless of the process, was to make images.
I studied literature during my BA and will keep doing so during my MA, so the visual art world is still at a certain distance from my experiences. Yet somewhere I was attracted to how visual arts become a manifestation of the mind that is not literalized the same way than it is with words. Images don't simply mirror or copy what they represent, and that is still the case with photography, whether or not we give it any bearing to truth.
I find the visual stimulation exciting in more dimensions than the literary one, although it cannot create the same excitations. When you read books you're going one way, and it's only when you conceptualize the story that it becomes liberated from time. With pictures, you can remove time and the linearity of things. I know you can read time in a picture, but what interests me is the impression that being out of time can make.
Finally there's the sheer beauty of the materials and its graceful defects. I hate JPEG noise, but you can give me grain the size of softballs and keep me happy. Looking at a well-made print is as worthy for me as looking at a good painting.
So I guess I do photography because I like photographs, and because I like to do it with film and paper.