They are your best friend. Make sure they have fun. Even if they draw out on you and you actually give them some money it just ensures they'll be back to lose more later. Don't belittle them. Don't make them feel bad. They want to gamble. They are on vacation. If it's a fun community game rather than an individual game. Make them want to stay and give more away. Make them want to come back to the hottest game in town. They are your profit.