Ah... Matata we all know you play up in those mountains of yours and its not really "work". Try sitting in front of a spreedsheet for 8 hours one day. You'll appreciate those 'working days' of yours!
I've had a log deleted on me. I emailed the owner, explained I was there, saw what had to be seen, sent a pic proving it and he/she allowed me to relog it. That was in Machu Picchu, so I was determined to maintain that find!
I do log DNF all the time, mostly because I am an ignorant cacher without a clue of where I am going or what I am looking for. But I just got myself a palm pilot and cachemate, so I expect my DNF ratio to drop now. What a useful tool! (*Note: I guess I could have bought a printer 2 years ago but.... )