"It is important to understand that the purpose of a blog is not always to get the largest and widest readership possible. The purpose is usually to communicate with interested individuals. Even in business, the number of those individuals may be very few, but the impact of the communications can have economic impact far beyond its cost. For example, for a business selling high-ticket items or services, one sale can make up for the time cost of a whole year of frequent blogging.
Discussing ideas like this seems to be of interest (and surprising) to many people. As blogging moves more and more into the mainstream, it will eventually be surprising when you don't use a blog."