There are very few people who bet on gambling for fun and less so most people gamble with the intention of making money. But here those who once become addicted will keep betting and no reaction to losing or winning can stop them...
That It is actually debatable, though, the actual percentage of gamblers who partake in risking their money for the sake of entertainment and others who actually to seek to get profit out the casino is not actually known, I personally believe anyone who partakes in gambling keeps a minimum of expectation within themselves about the possibility of making profit off their gambling sessions. If I had to guess, I would say it is about 15% the actual fraction of people who have managed to reduce their expectations for profits to the lowest possible and mostly gamble their money for fun or amusement at this point.
Those who are addicted to gambling are a completely different kind of gamblers, they neither gamble for fun or money, because they cannot stop themselves even while in profit.