It really doesn't make sense for a hubber to pay to have articles written for them. The whole concept of hub pages is for writers to learn and grow. One article isn't going to pull in enough revenue to make it worth while.
We don't buy articles for posting on any platform. There are writers who do free lance work for us. Nothing written by them is currently used for hubs, blogs, or ezines, directly for our corporation. No hubber has ever ask for us to write articles, however hubbers have asked to do free lance work for us.
Since all our work is business related it takes a special type of person to pull it off. So far we have found one hubber who fills this need. We are sure there are more out there and we will be looking for them as the need arises.