Who should pay? You decide.

Facts:

Fourteen gamblers were playing baccarat at the Golden Nugget Atlantic City.  The game was being played with eight decks of cards.  Typically, the playing card supplier sends preshuffled cards to the casino.  However, on this particular day the cards were not preshuffled.  The gamblers eventually recognized this and won over $1.5 million because they were able to predict the cards that would be drawn from the unshuffled decks.

The casino cried “foul” and, citing Nevada gambling laws, is suing the gamblers to get back the $1.5 million.

Question:

Should the gamblers have to pay back the money?