Cock fighting is not a luck based game, rather I will call it a game that cruel people love to play and bet on it. 
I think it's still a luck based game because you can't say who's going to win the fight since the involved is animals. It's not the typical betting game wherein we can somehow predict the winner based on their previous games.If you ask me, I will never be able to even watch this bloody game. How do people get amusement seeing these cock fight games? Also, can people sleep if they have won money on gambling on the blood of cocks.
Same here. But there are many people who think this game is enjoyable and satisfying to watch, especially if you're the owner of the cock. It's cruel but as long as it is not prohibited, then this kind of gambling will continue to exist.