No matter how reasonable an advice is from someone that's not addicted to gambling, it's futile because there's no way that gambling addicts are ever going to hear it or follow that because reasoning with them doesn't work, self realization is the only thing that's needed before they can start hearing out some advice, as the saying goes, you can't really help people that don't ask for help, it's not really your duty to save them anyway, give out the advice and let them know that you did your part but never put too much effort into it because they'll end up hating you for it.