If the answers are just _wrong_, you can downvote them. If they are unrelated, you can flag them for moderator review. (Not-an-answer answers appear to get vaporised very quickly, _once someone finds them_.)

Check the [Unanswered](http://stackoverflow.com/unanswered) display -- it shows both questions with no answers and questions without up-voted answers. I don't know how many users actively read this query versus the main [Questions] query, but hopefully it is enough to help garner new answers among users not in the [The Fastest Gun In The West club](https://meta.stackexchange.com/questions/9731/fastest-gun-in-the-west-problem).