I knew I was a sadist, but reading this thread makes me realize how much of one I am. :p
I'd pay money to hurt someone. I'm not a monster though, I don't usually hurt people against their will (unless I lose control of my urges). Thank god for masochistic people.
If it were up to me I'd have crucified every single IS member alongside the most important road of Syria to set an example to the world. I have a strong sense of justice and no empathy towards people who kill the innocent. Would I kill an innocent person for money? No.
I also wouldn't torture someone so badly that they need medical attention. But erotic asphyxiation, hair pulling, slapping someone in the face, scratching someone with your nails, (sexually) humiliating someone, biting, etc? Fuck yeah. Not against someone's will though.
I also don't mind hurting myself when I believe I deserve it. I once burned my hand to the oven. Although I rarely do that, I don't want permanent scars lol.
