funny. i had a class a while back where the proffessor did an experiment with us. gave us a sheet with the horoscopes from two days ago but they were mixed up and without the labels so we couldnt tell which one was suppossed to be pisces, virgo, etc. then we were to pick the one horoscope that best matched the day the horoscope was for. we turned that in along with what sign we were so the teacher could match up our answers with our signs. there were maybe 100-150 people in the class, so the sample wasnt tiny or anything. it turned out, less than 8% of the poeple picked their correct horoscope. if we had picked purely at random, we would have gotten more right. the proffessor does this with all his classes and he said this was the normal result.
another story. my aunt used to be into tarot card reading. was convinced the shit was for real. she studied it and learned how to do it, gave readings to people all the time and was amazed at how accurate it was. then one day someone convinced her to do an experiment. she would give the exact opposite reading that the cards read. if it was for real, the the fake, opposite, readings should all be wrong. but they werent. it didnt matter if she read the cards right or wrong, it still had the same effect. she no longer believes in tarot cards.
horoscopes, astrology, numerology, tarot cards, crystal balls, ... are all based on the simple fact that 99% of humans are suckers. we are social animals and have a very deep seeded need to believe in something "bigger" than ourselves. to be part of a group. that part of human nature is very easily manipulated and has been manipulated over and over and in many different ways since the dawn of civilization. untill a person comes to realize this simple fact, they will be a victim. sure, most of this victimization is realatively harmless, but it can easily get out of hand rather quickly.