question Set category in Afternic & Sedo, useless??

[eternaldomains]

Sedo n afternic lets you set categories for domains but when searching as a buyer it seems so hard if not impossible to find a domain category. Is setting categories there completely useless?

 

[creataweb]

I don't use it. Waste of time for me.

 

[Domain Executive]

I don't use it either.