I noticed something strange about a yahoo user: How did this person lose so many

points? The person who answers this question, with the username "anonymous".....
http://answers.yahoo.com/question/index;_ylt=ArLwSoCtsMlTVFqXGumflITsy6IX;_ylv=3?qid=20130107165506AAnfXd6
only has 61 points.

but in that best answer; she got 460 thumbs up.
When someone gets best answer, yahoo gives the user 10 points, plus 1 additional point for each thumb up.

So that should be 470 points.

and looking through her profile I see she only asked 21 questions.
each one costs 5 points, 21 x -5 = -105 points.

470 - 105 = 365.
plus she gets points for answering and visiting, etc.....

So she should have MORE than 365 points.
but she doesn't.
How can that be?