Lotteries explicitly and extensively inform the consumer precisely what their odds of getting a significant ROI are (namely "slim to none") and lotteries are heavily audited and regulated to make sure they deliver exactly those odds. When polled, those that play understand those odds for the most part and those who play the lottery compulsively understand that they have a problem, in spite of the compulsion.

A rather poor choice of analogy since I think all of us would be perfectly happy if these cryptocurrencies were managed the same way.