But do you really find going around telling people that they're not going to win the lottery makes them stop playing?"Not 100% successfully, but of course it helps. Why don't you go around and ask some people why they don't play the lottery?
I think such advice misunderstands the psychology of why people gamble on very long odds.
It's why I don't gamble. It's why lots of people don't gamble. People aren't completely rational, but they're not completely irrational either.
Helping people put understand the true odds of what they're engaged in is a good thing.
What do you have against people knowing the facts?