I think one of the typical scams perpetrated by unethical fortune tellers is "curse removal." After several sessions, the fortune teller suggests to the client that their money is cursed and if they bring it in, in the form of cash, of course, they will remove the curse with spell, involving a cloth, broken eggs, etc. At some point they pull a switch with the money, keeping it. One may ask how somebody would fall for something like this, but I imagine that it is fairly desperate people, maybe somebody very grief-stricken over a dead child, going through a bad divorce or something, and people don't think right in these cases. These type of con artists have very good timing and can read people--they gain the persons confidence(that's where the word con comes from) and don't make their move a second too soon. I agree that the guests on C to C probably don't engage in this. Going on radio or TV is not part of the M.O. of this type of scammer. There are other types of C to C guests who have developed ways if getting money out of desperate people. I think we know that.
I looked at Pam Grout's picture on the Internet and think I know why these hosts like to interview her, in fact George himself is probably kicking himself wishing he had interviewed her--in the studio.