Do it yourselfers are hamstrung?

[Carey]

Actually these are officially "Show Game Roosters" and, although there are no "Game Rooster Shows" here, there is a very active export market from here... dealing in "Show Game Roosters"....

Here is a fairly well written background, inc. the fact that there is a scant trace of evidence that there possibly could have been a little bit of cock fighting prior to western contact, but the main infrastructure is only about 100 year old, with the huge popularity of the sport within the immigrant populations to Hawaii:
http://www.oahuislandnews.com/index.php/...-roosters/