Stevie Wonder has sung about how it's foolish to "believe in things that you don't understand..." Usually, this is true. I know a former radio DJ who benefited from a manager's superstitious belief, however. The DJ's pay was raised to $14.00 per hour. His manager said, "It would have been 13 dollars an hour, but I didn't want to give you that because it's an unlucky number."
That's quirky, to say the least, but if I were on the receiving end, I wouldn't have argued.