I don't like this kind gambling.
If people want to bet on animal, the game should be not torture the animal, instead it should be like dog race, horse race, smartest dolphin etc.
Unfortunately, my friend, there are more than a lot of people who like such "fights" and bet like crazy on them. And sadly, I'm sure that if you put 2 people in a cage to fight till death, it will have more success than animals. I'm 1000% against any of these "fights", and I would never support them in any way. Even if the "fight" is between 2 bugs.
Yep usually the rich people want to see the uncommon thing.
Many people will watch the fight and bet for it, the problem is human rights organizations and government who fight against that idea.