Hi "why" the Wii Does Not Have Dlc for Their Games?

Hi I own all 3 gaming consoles & I mostly use is my 360 since it has better games & early DLC release thanks to Microsoft. The only games that I play for the Wii console is the new Metroid: M & Resident Evil:Dark Chronicles. I just wish that it had DLC's for extra game play & is a rip-off that the Wii owners have Rock Band or Guitar Hero that doesn't include DLC's. Does anyone know why the Wii doesn't have DLC's? I think the reason why is because Nintendo doesn't care to their buyers.

Suggestion:

Some games do, but it's very limited. Some of the Guitar Hero games have songs you can buy, and there's also the Wii Shop but I guess that doesn't really count.

The Wii doesn't have a hard drive so it has nowhere to save the downloads to. It does have internal memory but most DLC is more than 256 mb which is all the Wii has (or it might have 512). Besides, most games Nintendo publish don't need DLC anyway because they finalise the game before releasing it, so there's no need for DLC.