The quantities are what changed. Taking a photo used to be relatively difficult and rare, so it was mainly reserved for relatively meaningful subjects. Which meant that having your picture taken was also relatively rare, and was something of a validation that you were interesting enough to merit being photographed. For that photograph to be published, even more so. Now cameras are plentiful and cheap, "publishing" opportunities are plentiful and cheap, and being photographed is commonplace and not appreciated as much. You can read all the meanings into my choice of the word cheap, by the way - as a price (increased supply made the price go down) or as a value (there's an abundance, so it becomes meaningless), or even as an implication about quality (low stakes means not as much attention or care for composing a shot).