Being greedy and overly trusting in gambling for sustenance is a bad concept and every gambler must make sure to avoid those features since they are the partway to possible addictions in in the long run.
It's easy to say this but in reality, it is almost impossible to convince the gambler that he is addicted to gambling and even more different to ask him to quit gambling. The gamblers don't care what is good for them in the long run, they only see the present and want to earn money through gambling.