How will knowing your future get you into Heaven? Just as Sky says, the Bible (if that's your religion) says involving yourself in the occult, which is what psychic abilities falls under, is a sin.

I don't know what you mean by the authority factor. Singing and painting may be things that can be shared with others, but what about being a good doctor? That's a profession where you help others.

And if a psychic has to spend his or her time using his or her gift, well, s/he has to make money somehow.