Personally, I don't pay attention to grading when it comes to photos. Considering that these photos were not collector's items at the time, most should have some wear on them from use in a newspaper publication setting. To me, I look at the gross condition of the photo rather than small detail. A clipped corner of a border means nothing to me as far as what I'll pay, whereas a figure being fully cut out will make a big difference with some milld ground changes as well. Another thing to consider are publication marks, like grease pencil, etc. Some like them like that as it shows they were used. Others would rather have them totally clean. Beauty is in the eye of the beholder.
What I mean is this...
This type of condition doesn't change the price in my mind but...
This definitely does...
Do I need someone to put a numerical grade on it to tell me that there is a difference? NO.
That all being said, if someone can figure out a way to make money on it, I wouldn't be surprised if it does start happening. THere are always people with lots of money who want the ego trip of having the best of the best of the best, so will pay through the nose for something labeled "perfect" or "10".