Gambling is for fun but the same time is another means of making money because people play for both money and for fun because if it is for fun then you should not be making use of the money you won, this shows that all we want from gambling is not more than the money.
That's it.
All of us are not just gambling to have fun but we're also aiming to have some money. Others can't deny this because many always say that they should only gamble for fun.
It's okay if that's the real deal but many of us aims to have at least more money when we gamble because there is a chance.
You are right, as even your intension is to enjoy but it's a different enjoyment when you win something decent then you managed to quit, just like what you mentioned all of us wanted to win even how small it is, still consider as earnings.
That excitement whenever you see that your balance increases and you feel that you dominated the game, there's fullfilment inside you that really satisfied your game.