Luck comes at any time that it can. There's no way to be it will always be to every gambler from time to time. If luck stays most often, what casino will profit? and most of the gamblers will win if that's the case.

Luck doesn't choose people, working or doing it for living. There are gamblers that do it for few times and they become lucky. Even the people who are doing it for daily life are even experiencing losing.