google has announce a golden rules for managing account, are there any one of you find it really work, or if we don't follow our account will be punished? especially for the rule of"an ad group can contain 15 keywords at most."
Where are you getting this from? Not from Google's official help files - http://adwords.google.com/support/aw/bin/answer.py?hl=en&answer=10316 QUOTE - "Each ad group has a limit of 2,000 keywords."
The golden rules are in the Adwords guidelines and policies. Nothing there about 15 keywords at most in a group.