This is supported by occasional reports of premonition, mostly not by professional psychics. If one has to avoid all stress and simply enjoy a sinple lifestyle, then I would think greater sanity will result. Unless there is some genetic factor favouring certain people, it should be an ability available to anyone. If you follow the passive ability theory, then adopt a relaxed lifestyle and put aside all worries, including that of trying to enhance psychic powers. If you have it, then it will blossom if allowed to do so.
Any psychic can gain a reputation by posting accounts of premonition.
Get them right, and your claims are beyond dispute. You'll see that I've won 10 pounds twice in a row. If not, then I probably have not.