I'm not saying it's important on a musical level.
You should know me better than that, I rant a lot about critics and hipsters putting greater emphasis on image than the actual music.
That being said, image has been a very important part of music marketing since the days of Mozart. And that will never change.
We would be without a lot of great and important artists if they didn't have the right, fashionable image to get people to take notice. You think The Rolling Stones would have been as popular if they looked like this?