There have been innumerable collections of things that other collectors or historians would kill for that have been lost because they seem like junk to the people that inherit it. I have ended up collecting vacuum tubes and I almost weep at stories of warehouses of them being junked. There have been plenty of other things like comic books, LPs, cameras, etc. that faced a similar fate. And while I would never argue that collections of these things are all that important in the grand scheme of things collecting is fun and brings enjoyment. If nothing else selling them can bring in a few bucks.
Losing historic pictures is just tragic. Any given historical image could prove to be important in some sort of research.