On some types of gambling, skill plays a role but there is almost always luck involved especially when you are playing a card game, dice, or slots where it's not all in your control. And the house always takes a cut.
I agree with you, we also needs luck but luck just equal for every person in this world it is just the time of luck will arrive that we cannot determine, while if we are really good in gambling so we do not need to solely rely on luck.