The only concern that I would have would be at casinos that do not wash the cards when the decks are changed. The cards would be in new card order, which would be known, and the shuffling recipe could stack the deck into an order that would favor the casino. With 2D games the cards are changed out every two hours or so, so a nice windfall for the casino would occur enough times in a day to add to their bottom line. 6D games don't bring in new decks often enough to make a real difference.