Good evening!
While it is true Users delete their questions once they receive answers they are seeking, not all the time questions are deleted by the asker. The Community Moderation and CC ( Customer Care) also delete questions by reporting them... Also, there are certain questions need to be asked and not to be stored on Yahoo! Database, such as an adult seeking opinion from the Community about her cheating on her boyfriend or husband. These Users are usually seeking valuable opinions and advice and don't necessarily need to keep their business stored on Yahoo! Database, so they would delete the question once the desired answer is provided.
Also, deleting your question and answer ( before they expire ) is handy as well, especially when one makes lots of grammatical errors and wishes to completely delete the question to re-write it, and delete the answer if they feel their content violates the CG and TOS.
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