You are saying you wear the same clothes and it sometimes works - logically, because as I said sometimes you win and sometimes you lose.
Now, try try to stand on left foot every time you are gambling, i am sure you will sometimes win.
Well, he has set his mind like a superstition, So it is hard for him to left all these type of things in a second. But we should see the right things and i am agree with you, that in gambling we win sometime and sometime we lose. It is a game, gambling has no connect with our shirt or extra something of superstition.
I think that's all a matter of perspective based on how you view it as effective or motivating beliefs, although miracles seldom happens to random people but i think it was just a mere coincidence that so called miracles normally result to everyone's life here on earth. So in that case of superstitious belief from people who option to have their lucky charms, just let it be and I know time will make them realize that everything was just a worthless practices. Everything is only lucky chances and not a reliability to expect as certain wins will happen always, because the possibility of success on gambling bets was on 1% out of 100% most of resulted to investment losses.