I agree, in part, although I think that your comparison falls short…writers, as a group, are having difficulty earning a profit not because of copyright infringement, for the most part, but because the internet has allowed anyone who wants to, to become a writer, thus over-saturating the market and resulting in an under-valued end product.
I think the same is true of photography (and art in general). Copyright infringement is an issue, but not the only or maybe not even the main issue. Most images aren’t iconic. By and large, a publisher has their pick of cheap images to use for a publication, and only rarely is the expensive image the only one that can be used for an article or book. Take, for example, the images above, these aren’t one-of-a-kind images that someone paid a fortune to use. They are actually stock photos from a site that charges $49 for 5 images.
“Band argues that it is primarily competition, not copyright infringement, that is to blame for the plight of professional photographers.”
Band’s argument is proven by the photos you used for the post…photos from a site full of great pictures from professional and amateur photographers. In other words, competition between all photographers has been enough to drive down the prices so that a “professional” photograph is now worth about $10 unless it is truly a once in a lifetime photograph.