First, I don't listen to that kind of music you mention. I listen to music that I feel that it's worth it, that has been put a lot of effort on it, and that fills certain void in my life.
Second, as a musician myself, I understand that creating a song, not to mention a complete awesome album or DVD or live show is no easy task.
Third, music is not an essential need. Just as games. It's a luxury that should be paid for. Not paying for it is not justified.