The reason why Buakaw doesn't wanna fight in K1 is because he does not happy with the new rules that has been made few hours before the fight. The new rule says that fighters are not allowed to hold the opponent's leg and make the opponent fall down which Buakaw has rejected that rules and the judges lose him right away.
The reason for this new rules is because there is a gambling going on which Buakaw has found out earlier on. The betting made online by K1 and some other businessman and mafia which bet lots of money on that. This is not a sport anymore this is an illegal gambling which goes around worldwide and the thai authorities has nothing to do with it and this is unacceptable because this event held in Thailand. This brings bad reputation to Thailand and the fighters itself. So who do you think should responsible for this?