I am sure that there is luck for the beginner in a gambling game, but most of them don't have luck in their first time in gambling. so base on your story, you have a big success in your first time, and you can win a lot of money.
for my first time in gambling, I don't have big luck, and although I can win the dice game, it doesn't mean my winning money is big. at least, I can get my money back so I can come back in the next day. and yes, I believe for the beginner's luck in gambling and it could happen to anybody.
I agree, i also believe in beginners luck, I've known some people who wins on their first bet of the game. I think they are just lucky enough to win in their first bet of gambling. I don't win in my 1st bet but there are still a lot of who believes in it because they've experience it. So nothing is wrong believes in beginners luck.
That certainly happened to me in my first ever betting game and the mistake that I did was that I bet a small amount of money and therefore didn't win much at all , the subsequent ones haven't been easy and you sometimes witness teams like Lebanese beating Barcelona which makes no sense at all.