You're right. On second though, you should probably leave any tools they might need to remove your trail cameras there also, that way they don't accidentally cut themselves with a pocket knife trying to take it down.
I also always leave a spare Glock and some body armor by each entry point to my house so that I won't have an unfair advantage against any intruder.
I also always cut the hooks off my fishing lures!
The more and more I read your posts, the more I realize how truly "special" you are.
To recommend that someone knowingly take an action which would intentionally hurt someone is absolutely asinine! There are PLENTY of other ways to solve the problem. A solution like what you have suggested should not even be an option.
Different people would take a different approach.
I like the GPS idea, but why put it in a dummy camera? They may find out its broke and throw it out before you realize its gone. I'd put it in a real working one, you're going to get it back via the GPS anyway.