I have never kept it a secret. At the beginning it is normal for them to be suspicious, but when they see that you regularly make profits, they believe what you have told them. The problem is the gambler loser, who from time to time loses more than he should. Those many times en up with their partner breaking up.
I agree with you here because not every spouse would be convenient with such and as a matter of fact, when he starts noticing that, he ought to stop immediately to avoid suspicion from his wife because constant losing would definitely incure reckless spending and demand for money, spending and not being accountable for the little given to him and that would start calling in for suspicion from the spouse and it will result to each other not being financially accountable for their actions and this is a major challenge in relationships where there is constant demand without any transparent and genuine accountability. I believe this was what made his wife to leave the marriage of years of suspicion and after every efforts she had put in, she found out her husband she has stayed with is a gambler.