When reviewing close vote queues I frequently encounter cases of several close votes on questions that have received one or more more or less elaborate answers, frequently with several upvotes each. Thus if the question will indeed be closed, I believe valuable effort and information would be lost. Naturally in such cases I vote to leave open. Presumably at least in some of these cases the answers were given after the downvotes. Could it be sensible to add a rule that would nullify close votes if there is certain amount of positive score from subsequent answers? Say, automatically leave the question open if the total of the question score (which might well be very negative) and all answer scores is positive? Plus also maybe weighing by close votes in some way...
I mean, in any case I believe we cannot afford losing any stuff with score that is positive in total, can we?