The Nintendo World Championships gold cartridges are more rare than the grey ones (only 26 of them were made). The Nerd also covered it some time ago in an avgn episode. Having seen it's not a "super rare elusive game", he smashes the overglorified cartridges with a hammer: https://www.youtube.com/watch?v=fs2wczJXETM
Thanks for the clarification. Given their value, that would indeed be foolish. Don't smash rare cartridges with a hammer, kids! That's not really the point of the video.