I don't believe in superstition, though if you believe in it and you think it works for you, then than is fine. I don't visit spiritual houses or shamans, and surely not for this purpose, maybe people who are addicted to gambling can go this far, but it is unnecessary in my honest opionion. Do any analysis you can do by yourself and wager what you can afford to lose, only if you take gambling as your source of income, can you go as far as visiting a shaman to predict games for you.
This is a choice and depends on everyone's beliefs, I will not prohibit or judge but maybe I will suggest and give a little advice about the concept of gambling where casinos do not involve shamans or spiritual houses as a way to get a win, but they only depend all the possibilities of winning on the luck that each person has and if indeed you are more confident in what you believe then go ahead, it doesn't matter to me because after all you are risking your own money in the sense that whatever might happen at the end of the session is all your business and only you will feel good or bad.
Yes, I am sure that there will be addicted gamblers who use spiritual houses as a medium for them to win, because as we know that addicted gamblers will do any action even if it looks absurd to normal people but according to them it might help. For me, all actions that do not make sense and have nothing to do with gambling activities, I prefer not to do it because it will only waste a lot of my time and may increase my disappointment and also make me even more confused when in the end I still lose. However, I will continue to be myself without relying on anyone in terms of gambling, after all, if it's time then I can also get a win.