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.
Most of the games which require skills cant be played, due to the fact that people can easily cheat in such games. For example consider chess, when you play online with other players, you dont whether you are playing against him or actually a bot.
And no one would play that actually or should I say its not viable in the market cause it does not attract so much players. To be hones, I am thinking of playing poker as they say you have a good chance to win in the long run if you focus on skilled base games like poker and other related games.