Mostly because none of the other methods speak to me. SN is out of the question- too much prep, sourcing the ingredients is hard, and I don't want to sit and wait to die after ingesting it. I don't have access to firearms (I'm in Canada), jumping or throwing myself in front of a vehicle is nope, and I'm not messing with gases and having to build a contraption in order to end my life.
Hanging is lethal, easy to do, and can be done anywhere at any time. Even if it's uncomfortable, it's over quick. I gave birth naturally, I'm sure I could handle even a few minutes of hanging if I needed to before becoming unconscious. But from everything I read, if done right, you're unconscious in seconds.