I wont tell you who I am, but I'll tell you two of the reasons I have for joining.
For one, it was posted to the topic of a channel I frequent on IRC, so I had to check it out...
Secondly, I'm a cutter, although I dont do it to relieve any pent up emotions or anything - I just recognize that kind of pain as highly pleasing. I also find those guro pictures highly aesthetic, and not to mention blood in general is a great turnon.
... And I suppose that's it.