I'm seeing a lot of incredibly judgemental posts here... it's pretty obvious to see who those people are who really don't understand the first thing about body modification or the impetus or drives behind it.
Just as some people will have a haircut, have liposuction, facelifts, go on diets, etc to achieve their idea of how they should look, but some other people have different aesthetic ideals. On the tame end of the spectrum, for some, that will be a tattoo or piercing of some kind.
And for others (me included - a reasonably well-adjusted and happy 34-year-old married guy with a good, well-paid job) it means going a little beyond that, into the realm of pseudo-surgical modifications (I have two sets of subdermal implants in my right arm, as well as numerous tattoos and piercings). Why? Because I like the way they look. They differentiate me, and make me feel that little bit better about myself. So why not?
Scarification, tongue splitting, genital bifurcation, etc, aren't my thing, but, if they were, it's my body, ergo, my choice. Some people find these things beautiful. For some people, these are positively life-changing experiences - not just the result, but the act of going through the modification itself. Whether it's cathartic, or the realisation of a long-held dream, most of the time, they come out better and happier people than before.
The sooner people understand this, and open their minds a bit, the better off we'll all be.
On another note, I went with a friend when she had a cautery scarification done... it smells of roasting pork.