So if they thought that someone can higher can guide them, so let them be. I have friends who prays before placing their bet as well, so I just respect them, simply as that, but it won't have any effect on the outcome though.
Just respect everyone's beliefs, I guess.
But I believe, there's no such thing or spiritual being that is influencing the results.
It is really based on luck however, people are free to follow what they believe in.
We all have different upbringing in terms or religion or culture, so those will be the factors why people believe on something.