We don't have a lot of caches out, but, far and away the least visited is our short (2 locations including the cache only a hundred m or so apart) multi.
On the bright side it's got a great favorite point: find ratio, but I guess we all hide caches hoping people will go looking for them.
So, why don't people do them? Is it "all that work for 1 smiley"? Or maybe fear that part is missing or tricky to find, making a long walk for no smiley? Perhaps it's lack of technical ability, people not knowing how to set their GPS device to the next waypoint? Maybe it's something I've not thought of?