Most Popular in Yahoo

[QualityDomains]

Does anyone know how many hits you need to get in the "Most Popular" section of Yahoo?

For example, in this section

http://dir.yahoo.com/Business_and_Economy/Business_to_Business/Communications_and_Networking/Internet_and_World_Wide_Web/Domain_Registration/Brokerages/

There are a few in there that I have never heard of. I would imagine once you have that position it's self perpetuating. Anyone one have any ideas on this?