I have given up trying to undertstand yahoo.
I can only imagine thet they themselves have too. I mean, what would YOU think if you were sitting in yahoo as an employee of their SE team, and you looked at the results of your work for most popular keywords?
I would give up and find another job.
Yahoo SE staff meeting, Monday morning:
“Morning all. Great job in the last 6 months. We brought spam down from 99.9% to 99.89%, and it only took us a light year in SE terms. Good job. At this rate we’ll catch up with Google in 3619 years. Double bonus for everyone and take a vacation. It on the company.”:shakebutt