Winning is inspiring people to gamble more and frustration makes us to gamble more as well.
So, both of them inspires to gamble more? 
I think it depends on the individual. There is a gambler who has good self-control. After a winning strike, it doesn't lead him to gamble more if it reaches the limit. Meanwhile when he gest frustrated, it is a big warning to stop immediately.
It seems like the more we gamble, the more we're pushed to keep going whether we win or lose. Over time, gambling can become addictive, and we feel the need to keep finding more money to use as capital. I do agree that some people can maintain good self-control when it comes to gambling. For example, I set a monthly limit for myself, and once I've used up that amount, I stop and wait until the next month before gambling again.