It's hard to not get addicted on gambling. When you convince a person that new on gambling and he won the first 1-2 bets, he will think "wow it's easy to earn money here" then he will bet again and when he lose, he will bet more and more.
That is the reason why we should not really convince other people saying that it is a good thing to do since gambling can not only give you a money problem but also a mental disorder.
Most of the gambling addicts I know just try gambling for the first time trying out their luck and did not know that they are addicted to gambling. Who would not want to earn easily just by betting your money though it do not happen.