Road Runner Beep Beep
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Yes or No answers are considered by many as a non answer and they will take them down because they believe it is a violation. Since you appealed and lost both appeal Yahoo must have felt the same way as the trusted member who report it. The community guideline does not say directly yes or no is a violation but it does say and I quote: If a post is neither a question nor an answer, it doesn't belong here. You didn't say how the question was written so given you an answer why is impossible for use.
I also don't agree with the decisions made on many appeals. If you seen an appeal notice it is signed by a South Asian name who's first language is not English. That troubles me. I had an appeal like you denied and I resubmitted it used the help menu and won doing that. So it seem to be a matter of opinion and not rules that they follow.
Anonymous
It's really hard to say without seeing an example of the one word answer that was used.
Daniel
If the Appeals were Denied Yahoo Answers Staff found the Violation
In Some Situations 1 word Answers are Unacceptable
Generally Speaking 1 Word answers are not a good idea people will think that your cheating or just posting to get the Points
If you posted something like Yes or No
Your Better off adding a little more then that Explain a Reason to Back it up why is it a Yes or Why is it a No
brian 2010
This is considered as a misuse of the Q&A violation, the very reason why you got the violation.
Anonymous
No idea but if someone is targeting your answers that is a problem. I've had a person who follows some of my questions and reports them.