I think it's a cool idea. Something like a RPG for geocachers. Something to do on a rainy/snowy, bad day for caching in real life.
I think we need to be less worried about the masses finding out about our game. We're always looking for more people to become interested in it - More players, more caches. Yes, more problems too, but that's beside the point... it's true of any hobby, sport, etc...
I know I personally was Extatic to find a family activity that got my children and Husband AWAY form the videogames and TV this would only defeat my purpose!