And people have "learned" that and somehow think that when the expected return goes "positive" that it somehow isn't silly anymore.
I would be interested to see it change so the jackpot doesn't go UP each time, but instead the number of winners goes UP somehow - perhaps by drawing an extra powerball if nobody has won for a certain period.
The absolute sad part of it is the large percentage of people who play and shouldn't; you rarely see the well-off playing, but you will see poorer people playing (which makes some sense, Bill Gates winning wouldn't change him at all).
Even sadder is what happens to the winners on average; the winner is often someone not good with money and they get given a large amount of the thing they're not good with.