The Beta badge is supposed to be awarded when you:
Voted 10 times, added 3 posts score > 0, and visited the site on 3 separate days during the private beta.
But there are plenty of us who've voted a lot more than 10 times, contributed a lot more than 3 positively-scored posts, and visited the site on all 4 days of private beta so far. Yet nobody has been awarded this badge. Why not?
What are the 'unspoken' criteria for the Beta badge?