I don't really have need of them, unless you're planning on throwing something at me. Or unless you want practice with me throwing things at you. With my mind.
I don't do the psychic persuasion stuff anymore, and I'm not sure what use it'd be in a fight anyway. One on one, maybe, but in a big fight, taking the time to get inside one person's head and try to persuade them not to kill me (without knowing if I'd even be able to do it) would be a pretty big risk.