Suppose I ask a question, and get several helpful responses, and select one as best answer. The respondents enjoy upticks in reputation when I and others vote their answers up.
Should my question receive downvotes, I might be tempted to run with my newfound information and delete the question, preserving my reputation. But that seems unfair to those who responded.
I suppose they shouldn't have responded to a 'bad' question. But one downvote can lead a user with low reputation to flee, leaving those who put their efforts into answering hanging out to dry.
So, the question remains, will deleting the question remove the gained reputation from those who answered?