The only reason why I'm getting another 3DS is so that if the one I currently have breaks beyond repair I'll still have the ability to play since I'll have another 3DS. Granite for some that would be a good enough reason to, it's just not an absolute need right now just more of a want. As well I don't have anyone around me that has a 3DS and plays the same games as I do that requires two people to fully play/complete the game. When Pokemon X and Y are released I'll be getting both and since I only have one 3DS and no one else around I won't be able to trade over pokemon, etc. An like I said it's more of a want(of course) then a need atm, I'd like to have a back up but still be able to play without having to buy a new one or send it in for repairs.
Which is why I'm waiting, especially for a special edition. They don't make many and can sometimes be hard to find if your not lucky. But Pokemon X and Y won't be released for another 9 months so it's not something I'm to worried about.