What gets me about astrologists and psychics, is they are preying on peoples innocent stupidity. At best they are reading their clients semi-accurately, at worst they are swindling them.
But in both cases they are not actually helping the client understand what is making them feel this way, and helping down on a path that leads to a healthier self-awareness.
We have a friend who doesn't not believe in psychology, but believes in psychics. She refuses to go back to a psychologist because the psychologist wanted her to actually think on and feel her past traumas, to discover why she has some self destructive tendencies. The psychic she eventually went with and still uses today (costing just as much as the psychologist -- more if you have mental health coverage on your insurance) just told her she sees why she is doing certain things, and to call her if she felt these tendencies coming back (charging her of course).
My wife thinks that so long as it is helping, it isn't necessarily bad. She feels that people shouldn't see psychics or read too much into the movement of planets and stars, but that whats the harm if it makes you feel better.
I feel that the amount of good they could do is way less than the harm they could do. And that the dangers of allowing another person to give you untrained/regulated advise is a terrible path to go down instead of understanding yourself.