Museums such as the Louvre simply would not exist if everyone saw a work of art once, and that's it. Therefore, why would anyone even bother decorating their own house with some art, if only planning to look at it just once? That also, can be the power of film.
As to the DGA awards, Hooper joins Steven Spielberg, Kathryn Bigelow, Ang Lee, and Ben Affleck for this honor. Omitted were Quentin Tarantino, Paul Thomas Anderson, and most serious, a favorite: David O. Russell.