If you assume only balanced and benevolent people will do astrology and psychic readings, that's fine. The problem is that if you have a little bit of problem yourself, a bit of delusion, it is easy to bring down the gullible that come to you. People die of preventable disease because they listen to their psychics. An astrologist with a bunch of fervent followers can make a transition into a cult the day he or she wants to make serious money.