It's just sad because they don't accept Bitcoin.
It would be cool if someone were to create gambling online where it accepts Bitcoin.
In my opinion it isn't sad that they don't take bitcoin, nor would it be cool if they did. I come from a country where cockfighting is illegal and is probably considered animal abuse (which it is) by the majority of people. I'm not against killing animals for food, since they're killed quickly and without suffering AFAIK. When you force two animals to fight to the death even if they're chickens, that's not cool.
No question about that screaming part that add excitement with the crowds, people who enjoys the cruelty between those fighting cock who are trying to survive life.
Yeah, that's the sick part. I'm assuming this is a popular sport in less civilized countries where life in general has less value than some others. My own country has many many problems of its own, but I think over the course of its history it has started to view even animal life as having value.