Used games can be used on the Wii U.
As you all know, when selling games to GameStop and Best Buy, retailers will give you trade in credit for used games, and then re-sell those games to gain profits for themselves. This does hurt the video game companies, because every time people buy a new game the profits go to developers/publishers, but when people buy a used game the profit goes to the company that sold the used game.
The rumor keeps on flying around that Microsoft and Sony want to ban used games on their next gen consoles. That has not been unverified or denied by Microsoft or Sony. Even though Microsoft and Sony might ban used games on their next generation consoles, Nintendo has confirmed that the Wii U will not ban used games as from what Nintendo of America EVP Scott Moffitt says.
It’s unknown on whether Nintendo will ban used games in the future but it good to see that their next generation console will be able to play used games. So if Sony and Microsoft next gen consoles ban used games, let’s hope that the Wii U will keep GameStop alive.