Am I missing something here? Are these lotteries +EV in the first place? How does the lottery expect to make money if that is the case?
We call this "roll-over", when no-one wins so the pot accumulates. This week's draw doesn't need to be profitable, the overall scheme needs to be profitable. Say $2MM in tickets are sold, putting $1MM in the pot. And no-one wins. So next week, $2MM in tickets are sold, putting $1MM in the pot - which already contained $1MM from last week. Continue this over a few weeks. After 5 weeks you have $5MM in the pot - and an…
what do you think about the format: [scalar] [si-prefix] [unit]