While I haven't quite fallen into that error myself (I'm psychic, and I know how many "bad hair days" I have had personally), I've still been amazed throughout the years how many psychics there are who are "ethically challenged".
There are many psychics who are honestly trying to help people. They concentrate on empowering the people they're reading for —on giving you the information you need to make good decisions. There are also many who aren't helpful. There are many who are just in it for the money, and will say or do whatever keeps that flowing, whether it's truthful or helpful, or not.
Worse yet, there are some psychics who are in it for the power, who enjoy playing head games and controlling people who come to them for help.
If you run into a psychic who makes you uneasy or that your inner wisdom tells you is bad news (such as those described above). I encourage you to excuse yourself to go take a phone call, leave and don't go back....
While I'm perfectly o.k. with people either charging money for readings or not doing so. dependent on the situation and their own values. I think the priority needs to be with two things.
First, providing the best, most accurate information that you are capable of. according to what's right for the client (Standards of "right" include such things as age, comprehension, and what that client can handle at the moment.)