Many lottos that have really big jackpots dont have winners. For example in my home state of MA we have a tri state lotto called Powerball. Winners are drawn twice a week, but often no one wins. When no one wins the pot continues to grow. So every once in a while the jackpot gets really large, and that encourages a lot of people to buy in and play.
To your point however, a ton of people play lotto. Many more then you think and many put a lot of money into it. Lotto makes money for its state and will usually fund feel good projects like schools to help justify how much money they generate for the state.
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