A pointless attachment

I was in GameStop a couple of weeks ago and I saw these:

This was one of those rare occasions when my wife was with me (she abhors that store and all within). She saw me go for them and immediately jumped to question mode.

"What are those? What do they do? Why would you want them?"

"They are extenders for the Wii remote. They turn them into foam swords to make sword fighting feel more realistic. I would want them because it would make sword fighting on Wii Sports Resort awesome."

To this, Brooke replied with cold, hard reason.

"That's stupid."