Twice that I know for fact, and another couple times that I suspect. The OP has deleted the question as soon as they know the answer.
I assume it was the OP, the two I know for a fact were both Excel questions. Today's question I spent the better part of 30 minutes between answer and followup, and now the whole questions just flat out gone.
I understand why bad questions, questions that violate the guidelines etc all being deleted. But when a valid question and answer exists, why can the OP delete it just because they now know the answer.
If there's another reason this is happening please tell me!
sorry had to rant, but it's also really hard to build reputation points when people do this...