I still do here and there. Used to burn, but it stopped doing anything for me. Cutting is kind of losing its appeal, too. Problem is I've been doing it a long time, and I'm running out of real estate. I wear short and sleeveless shirts at the gym. So I need to keep the arms and below the knees clean. That leaves me with the torso, which I scarred up nicely, last I cut. I've got unused space on my upper legs, but I'm worried they'll open up while I wear shorts. When you cut, and you want to keep it secret, you've got to plan ahead. There have been a couple times I've cut and started bleeding through my shirt because the cuts opened.
As for why, for the same reason suicide is appealing: it's a reassertion of one's bodily autonomy. Makes me feel I'm in control and have a means to express myself when I can't verbalize or even form a cohesive thought. When I'm spiraling downward, and it feels like nothing is real, or I'm not real, I know, at least, the pain I'm feeling is real.