1)A Wii is expensive, a DVD player is not.
2)DVD players are easy to find. Wiis are not.
2)Playing DVDs subjects your Wii to a constant ON duty cycle, which adds to wear on the DVD drive/laser, thereby shortening the life of both components.
3)The Wii suports only 480p max, and makes a mediocre (at best) DVD player.
well as i said "backup" if yr normal dvd player goes down yr stuffed till u can get your self a new one, but if u got the wii as one hey things to watch till one arrives.