I know the reason, it’s because “old people”, people older than 35, are the executives making the decisions as to what is important news. Not until we are their age, will videogames be discussed regularly on the evening news in the same fashion that movies are. We’ll probably also add comic books and anime to the mix as well, considering that we consume more varieties of entertainment content than our elders; who don’t know what “1-1” or “All Your Base Are Belong to Us” or “Justin Bailey” or “Up, Up, Down, Down, Right, Left, Right, Left, B, A, Start” mean.
Here is an interesting article discussing why the news media ignores videogames, despite it being the most popular entertainment medium and the highest grossing (and most recession resistant) by far. (Hit the link above)