I think superstitions are fun to have and entertaining to laugh about, it makes it more interesting.
I am just fooling myself around whenever I am thinking about such superstition. More like a self-boosting medication to cover up my fear betting on something I do not have an assurance of winning. People who just take this far are far more interesting than the superstition itself.
What are common things you're superstitious about when gambling?
Is this even a superstition? But I do look up on the sky and if it rains in this certain time I might go for betting otherwise I won't 'cause it is just a bad luck.