I've read that site too.
I'm not sure about Betta fighting, they don't just put two fish in a jar for the sick pleasure of it. It's part of their (thai Betta breeders) history and the rarely let fish fight to the death. If their fish wins, they get some money. If it loses, they put it in a jar and bring it back to health. The 5 star fighters fetch quite a bit on AquaBid, much more than the fancy ones. I'd be keen to get my hands on some true fighters, not for fighting puropses but they look so cool, nearly wild.