You know, that's true. You always hear about people making a pilgrimage to Mexico while in the last stages of cancer, yet I have never once read a success story - never.
I realize that when a Dr. tells you that there is no hope for a terminal illness, you don't want to give up hope.
That is a human reaction. And those quacks in Mexico prey on those dying people. They give them hope when there is none. And take their money.