People refer to it for the simple reason that life and future are uncertain and in order to have a modicum of self confidence to venture forth in any activity be it marriage, job, business, or travel, look up to these 'sciences' which include tarot, palmistry, tea leaves, etc also. The irony is even after they do so and go ahead with a favourable reading there is no surety of success as reality is "what is". But, at least it helps one to venture forth is its plus point if one is willing to forget the possibility that even in cases where the reading was not favourable they might have succeeded if they were bold enough to go forth! The best solution to the fear of failure is in developing self confidence and necessary knowledge and talent.