Nintendo Game Cheats

Nintendo say in their message that walk-through/cheat sites spoil the fun for those who have purchased the game. They also request that owners of these sites delete their online guides *immediately*.

To me it sounds like Nintendo think these type of sites hurt sales. But the thing is, how is it going to spoil the fun for Jon Doe if he does not go to look up these walk-though sites anyway?

I look up walk-through sites when I am completely stuck on a game.
Was stuck on a particular bit for Ninja Gaiden Sigma - a quick peek at a walk-through site helped me get to a secret entrance and I was only may way continuing to enjoy the game.
I personally think that these walk-through sites help enhance gameplay - players need look up only what they need to move on in the game.

Do you think walk-through sites "spoil" the fun? Do you use these sites?

Below: The warning found at the official site for the game.