Can a question be restored if the owner deletes it?
10k users and moderators can vote to undelete a question; as usual, the vote from a moderator is a binding vote.
As far as I can see, a question deleted from the owner has never been undeleted. The question could have been deleted for many reasons, including:
- the OP realized he asked a silly question
- after the OP discovered the solution for his question, he thought the question could not be of any help for other users
- the OP didn't receive any answer, or the only answer is wrong, and decided to delete it because he thought nobody would answer the question
If users keep deleting their own questions, then something is wrong; probably they are not asking the right question, or the question is too vague to get a precise answer, or an answer at all.
As far as I know there is a limit to the number of questions users can delete, but if a user have 5 questions out of 11 deleted, there would be a problem; probably the user didn't understand how to use an SE site.