Actually, mostly gambler are superstitions, may be he is one of them. But it is not bad or good, it is a habit. Because people think that now today they win because of he do something unique and different thing. Then on the other hand, some people think that today they win because of luck, Then clear both are superstitions, but the difference is that we believe on luck but other ones believe on different things.
You have a point. I also believed that most gamblers are very superstitious but some are not just admitting to it. But you will learn from them are they win big and attributes it to something besides luck. You will hear them telling stories about how they change their luck by like changing seat or just simply change their playing way. So whether we admit it or not, most of us are into superstitions without knowing it.