Value is a convention of agreement. When the Baby Boom Generation was massive and there were a large number of people who were collecting fine art photographs, perhaps there were enough people who agreed in the value of a photograph to make it seem like a worthwhile investment. Now that so many Baby Boomers are downsizing and divesting their precious photograph collections, there is downward pressure on prices. Sorry to say it, but I'm seeing lots of photographers who are coming to terms with the truth that their collections aren't worth what they thought.