The issue has been addressed ealier. I'm mainly active on tex.stackexchange. There are some thousands of unanswered questions. I suggested to introduce a new reason for closing questions: an abandoned question, to get as much of them as possible out of the way when answering the unanswered. The moderator there declined, because tex.stackexchange can't extend the core closing reasons.
So here I am. Can we have a new reason to close questions: abandoned questions?
Definition: A question is abandoned, if it has no answer + somebody required additional information + the person who asked did not log in for a week after the additional information has been requested.
In general, I'm not a friend of closing questions. But people who ask "doesn't work" questions and never ever come back, cause unnecessary effort, because the question will be opened once in a while by somebody, totally in vain.