This is mostly the truth among the addictive gambles you can say it. Because for those who actually play for fun would be realistic and may not play more to recover their loss and thus in this process of making profits from losses turn them to addicts.
That is why to play for fun is actually much better than playing for profit. Afterall we dont want to risk more than what we can afford that is why I dont suggest people to play for profit unless he has alot of money that he can throw. I dont really believe that the profit from gambling is for everyone to take as well
Even if you are gambling only for fun there will always be an inner desire and wish to make money out of it so I don't think that people gamble only for fun as their main intention is to make good amount of money in quick time which is not possible with any other method.