Sleeping Dogs cheat codes:
Once you are able to bet in cockfights, go to the arena on the far
left of the map. Most of the cockfight arenas have a betting cap,
but the one on the far left does not. Save the game immediately
before talking to the NPC at the front of the arena. Then, place
a bet for the maximum amount of money you have available.
If you do not win, simply load your saved game and try again.
Repeat this as many times as desired.