I used to have a huge snapshot collection...I collected them when not a lot of people did and you could get lots on ebay for pretty cheap...haven't really searched them out for a few years, but I get the feeling that they are no longer an overlooked area of collecting. Professional photos are great, but there's just something about the amateur snapshots that's very appealing to me.
I kept the ones that fit my collection.
c1910 Lincoln minor league game
Wahoo Sam Crawford
Clarence Mitchell
Dazzy Vance