If at all if i am gambling i would do it to make some profits and it is not a fun game at all.I do have a lot of other activities to do in the real world if its for fun rather than wagging my money over it.
My recommendation would be, if you are gambling for profit. It is much better if you are going enjoy every bet's that you make. Because that's the essence of gambling to have fun and if you win that's a good thing for you. But if you lose, then just think about that in return of your lose, think it as a payment for the entertainment that you got from casino.
No, there is no person that is making fun when he is losing. Even you or I are just gambling for fun only but if we are losing that is against our will because we are still hoping to win, just win the game and if there are some amount involved that will be returned to us that's better. Just don't always gamble greedily or else you will end up bankruptcy.
There are always exemption. These are the people who plan first on how much they are willing to lose just to have fun. These people are more likely the responsible one. And yes people can enjoy gambling while losing, that is, if they pre-conditioned their minds that they will have fun no matter what the outcome of the game is.
But at the same time it can make people go greedy and take risky bets and lose everything in the process. So gamble with what you afford to throw away. 
