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.
Spirituality doesn't mean to have super powers, which include predicting future events accurately to win the jackpot. It's just that you are influenced by spiritual dimension, accordingly to the kind or category of spiritual elements you connect yourself to. The highest the frequencies you connect yourself to, the more evolved and uplifiting influences you are going to receive in counterpart, in a constant interchangeable process, where you feed the spiritual world with your thoughts and actions, while the spiritual world feeds you with its influences.
Spiritual isn't exclusive to few individuals who claim to be religious leaders or to have supernatural powers. Spiritual impacts everyone's lives in real time, 24 hours a day. It's not possible to avoid or to deny it.
Many people don't think it make sense nowadays, because this world moved too far away from its origins and essence. But the more the world moves on the contrary of its origins, more connected it becomes to the lowest frequencies of universe!