I was wondering that too. Maybe it's because it's harder to clear the threshold from asknew. I remember a blog post saying posts get more votes in general because of the influx of submissions.
This posting made it 15 :)
Might be date-related; all are from past 3 days
It's the AI. Everything gets answered (somehow), no direct questions need to be asked anymore.
(you're right - I was wondering the same thing 1h ago :o) )