This answer by Amzoti has had 15 upvotes as of now. I would like to understand what makes this answer so great. I think it's a fine answer and I'm not trying to pick on Amzoti in any way. I just came across this question by accident and it's a good example of the kind of voting I don't get.
The timeline of this "lucky" answer, in my local time.
- Amzoti posts the answer: Sep 29 at 15:14.
- Question asker deletes the question (and thus the answer): Sep 29 at 16:02. S/he was able to because nobody upvoted the answer by then.
- Amzoti posts a meta thread Deleting questions with answers and no upvotes?: Sep 29 at 16:29
- Three users, including a mod, undelete the question: Sep 29 at 16:53
Presumably, the existence of the meta thread resulted in additional traffic to the question, and in the unusually large number of votes (both on the answer and on robjohn's comment).
Conclusion: the number of upvotes is a function with many variables, not all of them mathematical.
Further conclusion: it would be better to have a meta thread "Requests for Undelete Votes", eliminating the need to create dedicated threads for such cases.