More often than not, users tend to post questions with a problem but don't actually post the code required. This results in the first comment being "post some codez then" followed by an inevitable edit on the question. It is only after this exchange that the question can actually be answered
Another issue I've seen is people obscuring code, hiding their precious variable/class/file names but in some cases they are just hindering the question.
A fine example is this question, which itself spawned an answer that doesn't answer the question, just corrects the obscured code.
Would it be possible to add something to the FAQ or maybe even with certain language tags (PHP, jQuery for example) have a a reminder in the right hand column to prompt people to paste in the code they are using. Maybe with jQuery you could even point to jsfiddle or similar.