It is very true, cause if you win the first time, you already believe that this method is going to work and you also believe you will be lucky again. So you will come again.
Yes, when anyone win money on their first visit or try surely they will be more existed and would like to repeat same again and again. But after losing money more than what you won then one should realise it that gambling is not for making money. Anyway if it is fast and free money then mostly no will not control themselves without trying their luck. Free and fast money is the most important thing for gambling addiction.