Cutters were big in my kids Texas high school. Seems girls were into it more than boys. All kinds of kids do it...not just the Goths and loser kids. My kids think that SOME kids do it to be "cool". I know.........disgusting.
I've known different Goth kids/adults in my life. Most of them were just morbidly depressed. Some were just bored and ignored and it was a way to get attention.
Funny, but most of them would faint at the sight of real blood ;)