Casino Gambling De-evolved

It seems that gambling on animals has actually de-evolved from horses and greyhounds to (arguably) more primitive species. Police in Hong Kong arrested 115 men for gambling illegally on insect fights. From the article:

"Police seized about 300 crickets and $1,025 in cash during the bust, said police spokesman T.K. Ng. The alleged bug gamblers remained in custody Sunday, but weren't immediately charged, Ng said. Illegal gambling carries a maximum penalty of $1,280 and three months' imprisonment. " Full story here.

The thing that strikes me as odd about this story is that, unlike dogs or other 'bigger' animals, insects don't really fight much. I can imagine a large group of men, screaming and betting, standing around a small ring where two crickets are just sitting there, looking at each other and occasionally chirping. I have to watch more Discovery Channel, because I have never seen crickets launching at each other's throat or doing anything remotely violent or agressive that does not involve chewing plants.