I would love to know, how about some one who experienced it happen before their eyes such that a prediction was gotten from some sort of spiritual consultation and when followed the way it was prescribed, they got to win the game, how then can you convince such person that they were just lucky and not their spiritual manipulations at work? Because I have heard from people who saw things like this play out before them and they had their bets won and they made money from it, this is something they did not experience when they did it all alone, they saw results after some spiritual involvements.
Go ask those people if they use such spiritual aid to constantly win their bets and their answers would likely be no, that's to tell you that luck plays a major role in gambling and not any spiritual aid, you can't beat the house and if such things do exist then most people from Africa and other continents who take spiritual practices more seriously would've beaten the theory that no one can beat the house. Also, concerning those who win a jackpot if you ask them how often they win they'll narrate how much they've lost or win minor cash before they finally hit the jackpot, so dear the good result they saw is based on their believe on winning the game and it's backed by the luck factor.