Oh, they're not 'becoming' problem gamblers. They were always somewhat troubled by the idea of easy money I think.

I think that if you look in the news you'll find no shortage of sporting legends that have gone bankrupt due to gambling and other excesses.

It seems to be a mentality thing - they always want to win and they don't understand that gambling isn't one of the things where the effort you put in actually has an affect on the outcome.