StackOverflow took on a tough challenge in getting its members to self-curate the body of questions on the site. They were smart to recognize that "more isn't always better", and thus gave moderators an incentive to identify and close off-topic questions.

There's nothing wrong with that idea, they just have a bug in the implementation. Somehow they've incentivized the closing of good questions that are frequently on-topic.

Here's an example of a plainly on-topic-yet-closed question that annoyed me recently: http://stackoverflow.com/questions/2847655/find-threads-runn...