I do not think they will listen because they do not need to be corrected what they need is to realize how wrong they are with the thought of gambling to earn as their primary source of income..
As long that kind of mindset is still imprinted to their minds they will never get to listen what everybody is trying to say, this is base on my own personal experience with dealing to a person which was my former co-worker in the same department who quit and resigned his job because he hit big in gambling and he tried to continue his living by doing more of the gambling work. We have not seen for a long time now but I heard he is now working again to a different company in which he again started at the bottom position.
Different person will have different threshold, if you're get paid for $1K per month, but you win $100K from gambling, most people will resign because they think their jobs aren't worth it anymore. However, when someone don't have experience to manage big amount of money, they usually spend their money for unnecessary thing and believe it's a good investment.
That's why someone who won a lottery mostly back become poor because they can't manage their money.