Everyone has their own luck, but it all depends on how much luck they have and how often it happens. That's the problem, because some people actually have very little luck in gambling. Or, if they do have a bit of luck, it's because they've already lost much more money. So, it's like looking at your own doom if you just start gambling, without proper management, relying solely on luck like in slots, and don't have bankroll management.
I think recording a good win already is a good sign of luck, I interpret it as luck being on the gambler's side. On the other hand those who don't hit big have very little luck or their time has not come and I think they should maintain their sanity by having a budget, so that even if they're not hitting it big, they wouldn't be hurting their finances so much.
The luck factor is evident, everyone has equal opportunity of securing a huge win, so while you gamble responsibly, you stand a chance to hit a jackpot and when you do, do yourself a favor and withdraw so that the casino don't end up enjoying your wins for you instead you of doing it yourself.