What story teller wanted to say?
OP meant that if you are a fearless gambler, your chances of winning are higher as opposed to a person who do not take big risk in gambling. Although I somewhat agree that you should have appositive mode when you play gambling and should have belief in yourself that you will win but again sometimes the luck even do not help the brave too. It will also make you lose big if you take more risky moves.
I smiled as soon as I understood what Op is trying to say. I guess the casino owners are scared/suspicious of brave bettors who take risk with high bet. I thought they want big bets, never knew some are scared of them. Or they are probably terrified of the "bravery" or "believe" lol. Interesting irony.
Casinos are not really "scared/suspicious of brave bettors who take risk with high bet". They want this kind of brave or high-risk takers. In fact casinos would extend additional treatment to high rollers. In casinos, big time gamblers are well-loved and even labelled as VIP. There will be perks given to them that ordinary gamblers cannot enjoy. What they probably hate are those who hit, and hit hard, and then run afterwards. Casinos love brave and high rollers for as long as they stay. The longer they stay, the higher the probability that they will lose. If they win but continue to stay brave and risky in betting, the casinos will always have the last laugh. And so they don't care much when these gamblers win; they know these gamblers will lose eventually.
What casinos hate are these:
These players come like Barracudas sttacking prey and leaving quickly having feasted.