The fun will always be there even if you are losing money and you will only feel the sadness in you, the moment you step outside on casinos having no money at all same thing if you just playing online.
If you're too focus about the money you're making, having fun wont help you at all and many are playing with a lot of greed, the result is very bad for them. Just enjoy playing, spend the money you're willing to lose and you must have a strong emotionional control so you wont feel sad if you don't have money anymore.
We all have different ways or hobby to have fun. But I think when it comes to gambling we should be responsible doing it. I agree with you that the fun will always get there when you inside the casinos even losing money. So my advice is to put limitations how much money you can spend in gambling so that no matter what happen, win or loss, you still have budget for your daily expenses or allowances. Besides gambling is not a prerequisite to living of you best life. Gambling addiction destroyed life so gamble responsibly.