Growing up, we had champion roosters. We would go to palenques (that's the arena where the cockfights happen). Big money gambled there. My dad made a lot of money. He kept the roosters in Cuba, and would fly them over when it was time.
It's sad ... I didn't like it. Don't like watching humans force animals to fight. If it happens in nature, it's fine...circle of life....but don't like it being forced.