~snip~
Casinos know that if big winners stay in their place while enjoying lots of freebies it can keep them coming back to gambling. They will forget to immediately go home because they are still interested in continuing to gamble.
That's why casinos still host them and expect those big winners to stay where they are. And the crowds in the casino can attract their interest in gambling again. But if the gambler has strong self-control, he will not be tempted by the freebies given by the casino and will still leave the casino to go home.
Or even better, get all the freebies, bet a small amount, less than the value of the freebies, and then go home, independent of the result of those bets.
But in reality we all know that the majority of gamblers will just lose their winnings, and actually most probably that big win will never happen really.