For me it's just about inflicting the pain myself rather than being able to let somebody else inflict pain on me. I have quite a bit of experience of pain & suffering with it rather than being able to drug myself out of it. The whole thought of going & sitting in a chair & letting somebody else rip a tooth out gives me the heeby jeebys, Grabbing hold of it myself & wiggling & yanking it out i can deal with. The Sparta feeling you get afterwards is your reward