I can't comment on the macro global statistics above (not smart enough, and not been in the game long enough) but I do have a micro statistic that is interesting.
When replacing a stolen cache recently, I was surprised to find (via one of the DNF's) that another cache used to exist in exactly the same place in 2012.
And I thought I was special.
Looking it up, I saw there were 75 finds on it in 18 months. My cache, in exactly the same place with the same D&T and over the same time, netted only 5. A 15 to 1 difference.
I'm not super dismayed by this, given that it's still a good cache in a great ravine, ( GC5DF7Q if you care to look) but I wonder too at how slow this game is played.
Altogether I have 30 caches in an urban area (Toronto) with varying difficulty and terrain levels. The real tough ones get 2-3 finds a year; the others average about 25. This is in a city wide mild saturation of about 1000 hides.
Is this slow or average now?
New people seem to be coming on always here and new caches too, and for sure there is certainly a core group whose names you finally learn as a beginner
The most important members of that group (and occasionally others) leave lovely interesting logs; which to me is fully 50% of why I stay in the game.
For I, like anyone else, likes to see some sort of reward for their efforts. I try to leave those same kind of logs on the few that I do find, as simple payback and also to try and stem the tide of the tftc - i.e. - at a local level - encourage the newbies and show them the fun. I don't know what else to do but be the thing you want to see.
The game is awfully slow at times, but there's still life in it I think, at least here, and real pleasure to be had.