Yes - I totally agree that DNF means I looked and did not find. NM is for I found it and it's in sorry shape or I know it should be here and it isn't.
I recently searched for a 2.5D for about 30 minutes and it should have been a simple find really, but I was on my hands and knees with gloves ready for use as it said you may need them, and I searched and searched. I marked it as a DNF. The CO was out just a few days later and posted a note that it was indeed gone and had been replaced. I quickly went out to find it haha. I think the DNF was correct here, but it's hard to know sometimes. The ones I drive by and failed to mark as DNF I think are there somewhere, but I was too nervous about muggles so I wasn't looking hard enough or long enough.
I put the PMO in simply to encourage thoughtful dropping .. IDK if it'll do any good. I saw it in a trackable and thought it was a good idea. The SUE tag on my trackable has in big letters "DO NOT KEEP" and explains the mission and everything - It's a custom metal luggage tag I ordered on amazon. I likely spent too much money on something that will go missing, but it's the fun in creating it for me so it's already been worth it.
I totally agree with the visits being silly now that it's been explained to me. I explained it to my family and they all understood too. We're set on changing our ways
I thought of maybe some "bad cacher" examples, but I like what someone on page 1 said - there's likely not "bad cachers" so much as there are inexperienced cachers. In a cache I found recently, someone had left packets of instant coffee and oatmeal from a hotel. I was under the impression food items are a no-no, due to ants and what not, so I ditched those items from the cache. Am I the bad cacher or are they?