It's heartwarming to hear that I'm not alone.
I'm also with you Ian, on feeling partly responsible for travellers that are placed in my caches. Crazy but, the idea of "cause and effect" usually niggles me when TB's appear to have gone AWOL. Thankfully whilst I've had a few scares, I think that there's only one coin that has not resurfaced yet.
Of the TBs/Coins that I've sent out into the world, I believe that three (out of fifteen) have been lost. The first TB I ever put out went missing after just a few weeks - I've since sent out a copy which is just starting to move around. The other two hardly got off the starting blocks either and, are listed as being in caches that have subsequently been reported as muggled. That said, as a bit of a niggle, after many months of waiting, it would be nice if the cache owners would consider doing some maintenance.