What is something that only exists because people are stupid?
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Lotteries. If people understood odds they'd never buy a ticket, or at least not in the numbers they do.
Lotteries are a tax on hope, not stupidity.
I've always heard they were a way to recoup tax funding from people below the tax-paying bracket, because they'd be the ones desperate enough to go for it.
...which is seemingly more and more at the way we love our income inequality...
You have a better chance of literally being Brad Pitt than you do if winning the lottery.