I just came across a question on SO that was essentialy: 'my program stops here' and a short blob of code. Nothing else. He hand't even bothered to properly punctuate the four-word question. There wasn't a description of the problem, stack trace, error message, or any indication which line was producing the error.
Several people pointed out that if the user wanted a good answer, he'd have to invest more effort.
But somebody answered anyway. Sure it wasn't a good answer, but the point is that some people will do anything for rep, so regardless of how bad the question is, there'll always be an answer or two. I downvoted the question after leaving a comment, as did several other people.
And then I checked out the asker's profile: almost 20 questions, one upvote, 20% accept rate.
This user did not deserve to get any help. Is there anything that can be done besides downvoting to put a stop to this kind of behavior? Maybe some kind of warning when a user has a certain downvote/question ratio?