One of the reasons I was turned on to the whole visual kei scene was the way bands express themselves. I love how when they go on stage, they're more like characters and they dress the parts as if they were in a story.
I also love v-kei because you can dress what you feel and be respected for it in many cases. And as others have mentioned, there are many different sub 'aspects' of v-kei, ranging from (as kurezi finely put it) metal to pop. This means MANY different looks and styles under v-kei culturally.
Hopefully I'll be able to go to Japan one day and visit the Harajuku district and experience the bulk of the visual-kei scene.
all around, I love how one can express themselves through their music and their dress with visual-kei