For the second time now I've found that a close vote has been cast for a question and I believe that the vote is based on a misunderstanding or misreading of the question. In such a case, I can only write a comment and hope that others will read it before joining the close vote. It would be better if I could vote against closing the question. I don't see a reason for the asymmetry of only having votes for closing, with a fixed quorum required for closure. In the limit of an infinite number of potential voters, an arbitrarily small fraction of them could close a question even if almost all potential voters are against.