The options keep multiplying. There's no such thing as a free lunch, right? Wrong: try the casinos, open 24 hours a day, every day of the year.Alcohol, food, live music and even cigarettes are on the house-all you have to do is to lose money. For winners, it's a net profit, with the added charm of not having to settle a bill. The casinos attract a blend of people, from the serious gambler to the amateur who's out for a lark, down to the cadger who's in it only for the free booze. Either way, the casinos are always packed. 'We don't mind the people who gamble a bit but come mostly for free drinks, food and the music. No gambler wants to gamble in an empty casino,' says one casino manager.