To have a plan for everything is very important. Most gamblers today have lost this statistic you are talking about, and that's why you will see them losing all their possessions at the end. I'm still surprised to see this type of person lose all they have due to too much gaming, and they still use the money to gamble. However, from the first time you see that you are not making money from gambling, why can't someone just live it and focus on other positive things in life? This is another reason why some people commit suicide today just because of gambling, and it will still lead one to gambling addiction.
I think the OP is advising people to gamble with a little amount of money, not that he is saying that gambling is bad, and the reason why he said that is because you can see that some people gamble without saving some amount of money to meet some of their necessities, so he is trying to let this kind of people understand that there is no use where some will gamble with a lot of money and at the end they will lose the money, but rather you should use a small amount of money to gamble that you can afford to lose.