Actually, I think that most people do NOT follow this practice, and I can say that while I would like to count myself as one that does this as a general course, I don't. I'd like to think I do, but if I am to be totally honest it is difficult to get a prediction and then just "shelve it away" as I go on with my life as if I had not been given that information.
Not to keep taking this thread off track, but I do agree with you here. I think most people who get to the point with whatever issue they are dealing with that they start calling psychics - these are, the majority of the time, desperate people who cling to every word these psychics tell them. Or, you have the psychic junkies who aren't necessarily "desperate" but also cling to every word. "But my psychic said!!"
The rational among us who take these readings with a grain of salt, IME, are in the minority.