Humans have always put great faith in oracles.
My first reflex is to assume this is a troll question. But checking your post history I find you have a track record for posting genuine statements, so I'm going to play it straight and give you an honest answer.
I find it is often revealing to examine the motivation behind an action. In this case, why do people visit a psychic? To get information beyond what humans can normally access. (And make no mistake about it, there are real spirits and they do communicate with humans. There is real power and information to be had in this area.)
While I can understand why people who do not know God would want to seek some kind of information like that, for Christians it becomes a question of why are we seeking this information when we know God? If we are seeking information beyond what humans can normally access, and if God has not already given us this information, either we are not close enough to God or God does not think we need it.
For a Christian to try to get information from a psychic is like a kid getting a negative answer from daddy, so he runs to ask mommy.