Casinos pump in oxygen to keep people 'fresh.' True/False?

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heh, you have any idea how much money it would cost to ship in and then pump oxygen into an area as large as a casino?

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Do you have any idea how much it would cost to keep millions of lights flashing inside a room 24 hours a day and billions outside for 16 hours a day, and pay every floorperson and security guard and cleaning staff and supply beverages at no charge?