What I have enjoyed most is that by watching the photo feed is that history comes to life, the history of ancestors, "real people", and not just "general people" you read about in a book.
I've seen wedding and children photos of different places and decades and seen how the dressing changed, I've seen the inside of a cabin with what I think is a gold panning pan hanging on the wall, I've seen settlers homesteads and can get an understanding of how my own family emigrants might have had it even though I don't have any personal photos from their homes.
I have also looked through my own family pictures, something I have not done for a long time and remembered happy times with family now long passed and wondered about the lives of those before them that I never got to know.
So I guess I just really would like to say Thank You for making this Scan-a-Thon happen.