~snip~
I will go with the first comment, every game is good when you are winning. And we can win on all games, but not always, that's gambling, you can't win all the time, or you can if you have enough patience to wait for red streaks and play big after they pass, but that can be exhausting (I tried that). Of course, we need to have luck, everything depends on your bankroll and gambling style, if you play aggressive you will be close to get busted many times, and you need luck to survive that!
But as you said, we cannot always win because that will depend on luck, and luck will come only to the right person.
I don't thin that luck only goes to the right person, luck can be anywhere not just in a casino, there's no right or wrong person to have a luck, what you need is timing, in the right place and in the right time.
But I don't think that if we play big, it can help us win because that will only risk our money to get a big loss.
Having a huge amount to start with is quite advantageous if you know a strategy that will best fit with you and with your money, just like the martingale method if you got bunch of money you are more likely to win. Yet still losses might come huge too if you didn't handle it right. If you got a small money and you enter in a casino don't expect to get those back when you exit, 20% of the time small bettors lose.