I seriously doubt any so called "yobs" or people likely to trash caches would go to such lengths as to find them via the website and go out of their way to disturb/smash a hidden plastic tub.
I feel with the new gps phones it will encourage a whole new wave of Geocaching enthusiasts, which is a positive thing. It gets people out and about and might just decrease the average age of a typical geocacher!
I just get the impression some people on here want to keep this fantastic hobby a closed shop, hidden secret, which is a real shame.
The idea of charging people to use the website to prevent some form of caching trashing by this "new" phone gps generation is almost absurd.