While attempting to delete a question which was answered by myself, and with no other answers, I got the following warning:
Delete this answered question?
We do not recommend deleting questions with answers because doing so deprives future readers of this knowledge.
Repeated deletion of answered questions can result in your account being blocked from asking. Are you sure you wish to delete?
I understand that deleting your question when someone else has answered it is effectively nullifying the effort that person put into that answer, which is bad. But is it bad if the only answer that's deleted along with your question is your own?