With that multiplier bringing in a total win of around $400, it simply means that he was betting around $0.3499 to $0.4, really conservative but he would have also won a life changing amount of money with that high multiplier if he was betting a little bit higher like say $10 to $20 per roll, but always better for gamblers to only risk as much as they can lose and feel very comfortable about it.
It’s all about luck. He hit that multiplier while betting that amount, but if he had placed a higher bet, there’s no guarantee he would have hit the same multiplier. Just enjoy your winning and don’t get frustrated because of what you could have lost.
The most important thing is to always gamle with what you can afford to lose.