That is right because when they gambling, they will thinks about money and not trying to enjoy and have fun in gambling. That will makes them gets deeper in gambling without trying to limits themselves from playing gambling. Their minds will also change and not trying to holds themselves from the next losses so that is why many people becomes emotional when they lose but that doesn't stops them from gambling.
If they are attract to other people's wins, they better thinks twice to follow what other people's do because they will not gets the same luck like other people. So they must thinks to always limiting their money and time when playing gambling so their lose will not too big and they can holds their emotional not to becomes bigger. We must control ourselves when playing gambling so we will have a chance to control our losses.
I guess that kind of mentality happened, I mean those who thinks that they can duplicate the same luck that someone already made will keep losing their money as emotion will lead them to keep seeking for that same luck. I mean, there are people who would love to win over and after experiencing it they will keep pushing for more instead of quitting and enjoy whatever they already got.
It's more on emotion control and keep that practice to avoid losing what you can afford to lose and regret with how you decide.
Other people's luck is indeed very tempting but it does not mean that we should try to pursue the same luck, there are differences in time and amount in terms of luck for each gambler, in the sense that if the person you see has won big now, it does not mean that you will also be able to get the same results by trying, remember that hope is not something that can change the results in the game, everything will always be abstract. And besides, I'm not sure that when someone wins what they hope for they will be able to enjoy it by cashing it out at that time, as you said that there is a possibility for them to continue trying to get a larger amount, and of course that is very possible when a gambler prioritizes winning.