I love the idea of sending trackable coins out. My problem is when someone logs, then holds it for an unreasonable amount of time. My wife's coin is in the possession of one person for more than two years now. An active member at that. Soft spoken requests to this person go ignored, and that in my opinion is just plain ignorant. On the other hand, I've taken great pleasure in watching another that I own make its way over to Europe and back again.
There's always a risk that a coin may go missing or end up being held for an unreasonably long period of time, however, the fun is in the tracking. Some do go missing, but at least I know where mine are in this case ...... just being held prisoner ...lol
Three others that I own are just too special to me, so I keep them as "travelling companions and log them as having visited a cache without actually dropping. Taking a "dip" so to speak.
Dive in and purchace a couple ... a small investment, with the caveat that they "may" disappear. Even if they do go MIA, it's very interesting to see where they travel to.