Why would someone want to have a job in video game designing

The better question is why wouldn't someone.
I myself am striving to be a 3D Modeler and Animator, and I feel it would be amazing if I worked on a game that was well renowned and loved by their community. I could play the game I helped design, and interact with the community who loves that game, and I feel that is pretty cool to be able to do.
Video Game designing is also art because, no matter what anyone else says, video games are art. You can easily find video games that have more emotion, character development, and story-line quality to it than many major HollyWood movies.