As humans, we are conditioned to look for patterns in life and we gamblers try to make predictions based on what we see, while we are gambling. The reality is that these patterns does not exist, but we like to pretend that they do because it helps us to bring order to the chaos that are gambling. 
I don't believe they don't exist, there's lots of spiritual energy in the world and they all have their role to play. Just like we had lucky socks when we were younger and it gave us confidence when we were about carrying out an activity like sport.
That's the same way this beliefs help us in life, even though they're not true as you said but they give us hope and with hope you can achieve many things in life. For example when playing the slots game, I go with manual spin and it works for me.
If I try spinning on automatic mode, I won't win any of the spin and would just have wasted all my money or in a situation when I win, the payout will be small when compared to when I spin manually and that's how I play when I want to win.