Hi!
Yes..it is very important. First..many possible customers will look at a knowledgebase as a plus when selecting a new host. I think it really helps conversions just like a active forum does. Also..a good knowledgebase allows your customers to help themselves to answer many questions..and not have to file tickets.

Yes..it is very important.

>>>I should point out it needs to be easy to use..or no one will use it.

Bryon