Because I've laughed, cried, and thought about more video games than movies.
Certain music and literature withstanding, games have created (overall) the greatest experiences I've ever had. The feeling of overcoming a difficult challenge, you know? The designers of Braid were quite brilliant, and Supaplex was a game that (even though I started young) took years to complete.
But now I have, and I have a great sense of achievement with it.
I could give a huge list of other shit I've done that made me feel awesome, but long story short, I play some games because I love working towards a goal, gaining skill and reflexes, some games because I want to experience a story, alter a world, be a hero, and some games...
Because I want to think.
And honestly Mirror's Edge changed the way I look at architecture forever, and encouraged me to actually go outside and run every other day like I used to...
And the soundtrack chosen for Braid was simply breathtakingly haunting and beautiful. It's not often that games make me think differently about the world around me, even if it's a way that I've considered and reconsidered over the years...
Still reminds me that things can always be different.