I certainly know how you feel!
I've even entered coins into the PGR geocoin race, and out of last year's only 1 of them is traveling still, and those were all drilled! Go figure! I guess if someone wants to take a coin bad enough they'll find a way to get at it, no matter what.
I don't really understand the point of stealing ACTIVATED coins myself. I can understand if you like it and want to keep it and drool over it for a little while, but its a travel bug like every one other thats out there that isn't a coin and should be treated as such and travel around.
I've found some copies myself, and many a cache with no coin in there when its supposed to be. The copies are OK, I suppose, but its not as exciting as getting the real thing, but each person is different.