I think that this often happens where a person is not at all sure of his bet and bets solely on luck. Then she doesn't want to share her luck with anyone else
It's strange, yes, because the probability of winning will not increase or decrease from that. But if a person is more relaxed that way, then let him
It is a very natural thing to bet and hope for luck, although it is still not certain whether someone will really be lucky. Because people who bet without expecting to win or get lucky are just people who are having fun with gambling, so it wouldn't be strange if someone who bets doesn't want to tell other people about their luck. Because this kind of thing can actually be done by anyone who has the courage and ability individually without having to depend on other people.
When it comes to gambling, it's a personal choice, even when the gambler borrows money and used it to gamble and possibly lost it, he or she will still pay the money because, gambling is a personal thing.
So when involved in gambling, it is absolutely up to you as the gambler to let other people know about your gambling activities or not.
Like myself, I choose to keep my gambling activities a secret to myself alone, except on rare occasions when I come across people discussing their own gambling experiences and I decide to join them and also share my own experiences too, and this people must be people I have not known previously, and may likely never meet again.
When it comes to family and friends, I keep my gambling activities to myself because I don't like people pork nosing into my private affairs, even when they aren't the ones financing that for me, so clearly, it is never mandatory to let people know about your gambling activities most especially, when they are not the ones giving you the money to gamble with.