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Perhaps, that person is very desperate on how to win in gambling games. They tried to believe in voodoo and try to use that "magic" to help them to win. . . . So perhaps, voodoo is still used by some people who really believe in that thing.
Yes, there may still be people who believes in voodoo while gambling. Apart from being desperate, as you have said, maybe they believe in such because they had the experience. I mean, they used voodoo before and then it worked well with their gambling, they won. That's why they continued that belief. Maybe a big setback is the only thing to change their minds. Or maybe it won't. Who knows, right?
I am sure they will not tell us if they used voodoo or not because that is their secret, and they don't want other people to know. Besides that, we don't know if that way can help them to win or not. Yes, some of them still believe in voodoo can help them in gambling. When we talk about traditional gambling, maybe there is a gambler who used voodoo because they already used it for a long time ago. But the name will not be the same as in other places.