But then, Vantiy is much to easy to "attack" to be worth -0. Which is a given, if we talk Mental Toughness.
Oh yes. Anyone has access to it. And it is easy to use it. And use it to cause discomfort. And there are so many options, consider this from Buffy:
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Giles doesn't want to hear it. He gives Cordelia a look like something's
wrong.
Cordelia: Uhhh, what?
Giles: Oh! I'm sorry. Um, your hair, uh...
Cordelia: There's something wrong with my hair? (pulls it behind her
ears)
Giles remains silent, but continues to stare.
Cordelia: Ohmigod! (quickly leaves)
Giles: (to himself) Xander was right. It worked like a charm.
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It is easily worth +2: and your player is either going to have a ball or kick himself for taking it.