I don't think there are any valid reason to continue gambling as it will not make people rich but it will just make people lose their hard earned money. For me only people that still thinks they can win good amount are still playing
some of them can certainly target victory because they decide to continue gambling. but not a few people who always want big wins can have an impact on sustained losses because the greed they have can eliminate control while playing
There is no point in continuing gambling due to certain losses if you are losing again and again you should quit gambling. There is a clear point if you are winning consistently and you have a good luck here then you should play but there is no guarantee to win every time. There are so many gamblers who have a bad luck in luck based games and they are continuously playing with the hope that they will win once but that day may not come in luck based games.