"It's good to learn from others, so you don't have to learn expensive lessons yourself"
I read this quote long ago, and I have been learning from others ever since

I know people irl who destroyed themselves/their families by gambling activities, there is this story of Mahabharta [1] where king Yudhisthira was led to ruins by gambling — so what saved you from doing stupid in gambling?
The last two parts describe the one vice and addiction of the virtuous king Yudhishthira – gambling. Shakuni, encouraged by Duryodhana, mocks Yudhishthira and tempts him into a game of dice. Yudhishthira bets everything and loses the game, leading to the eventual exile of the Pandavas.
From my personal point of view, it is rather difficult to learn lessons by looking at mistakes committed by others, because in the end, we don't actually suffer from consequences and in many occasions people believe to be more intelligent and savvy for them to fall for the sake mistakes that have led others to lose their money.
There is an old saying here in my continent, which says that the more important and lasting lessons are those that hurt us the most, and if we see something and does not hurt us, we would be able to learn anything from it.
Otherwise, there would not be so many gambling addiction stories and people losing all their money to their back luck, because there are already thousands of cautionary tales, still the number of people who gamble recklessly continues to be the same or raise as time passes by.