The high-end of the art photography market is just about impossible to break into. We have a nice art gallery in our city that specializes in art photography. Over the last 6 weeks they have been showing a large group of images done by a "famous" photographer from the 1970's. About half the images are being offered as "one of a kind" and the others in very small editions. They only had one sale.
Last year I went to the Fraenkel gallery in San Francisco, my brother collects photography and wanted to buy a few Robert Adams prints. I asked the owner if they take in new photographers, he said no... they have more than enough. By the way, the Robert Adams prints we looked at were $12,000-$32,000. The Adams prints were all small silver gelatin prints on 11x14 paper.