I know that the most important logs are the "Found it" ones but I think the other ones are also important in the game. The DNF mean the cache is difficult or it may have disappear, the "need maintenance" and the "write note" help the CO, the "maintenance done" are an important info on the CO...
What about a way to count them? We can imagine that the percentage of DNF in the total logs quantity can be calculate and comparate with the percentage of the other geocachers.
I think this statistic could be interesting