The fortune teller then helps lift the curse. It may be money to help perform a ritual to lift the curse or remove the negative energy. Sometimes the valuables are cleansed and somehow disappear. In the legal system this behavior is considered fraud and theft and the fortune teller, if caught, often goes to jail.
I cannot find if the victims of the curse scam feel better after their curse has been lifted or the negative energy banished. There are no studies I could locate on the topic.
At least I could find no studies outside of the literature for pseudo-medicines.
Is the practice of acupuncture, reiki, homeopathy, chiropractic and the other pseudo-medicines any different from the practice of curse removal? Not that I can see. They have the same basic principles, just different language. Barely.
Does the ends justify the means? It depends on the ends and the means. But in medicine
There is little on curses as a cause of illness outside of the bible references, so it would appear to an area with the potential for growth.
It would be simple enough to do. Get an online pseudo-medical degree, or better yet an ND degree. As an ND you can do virtually anything and call it therapy. Then set up a clinic to remove the negative energies and curses for medical purposes. The authorities will never look twice. And in a year or two you will probably be hired by the local University Medical Center's Integrative Medical Clinic. I bet the Cleveland Clinic will be the first.