The problem with this question is you're making the assumption you can turn on and turn off this special skill. What if you could read people's minds, but you're reading everyone's mind you come in contact with and you can't select who, what, when and where?
Or to be invisible, one would like to think you could appear in the flesh at one's pleasure, but what if no one would ever recognize you? You're just an invisible unmovable object in space that gropes hot chicks? How long do you think that would last.?