Most peple don't have very much to say that's interesting, and/or unable to write down their ideas in a compelling and clear manner.
It is often found that people who have most time to write have least to say, and the people who have most to say don't have enough time to write it. Thus, the real expertise within the organization lays hidden, as you get drowned in trivia.
Like practically everything else n the web, blogs are easy to start and hard to maintain.
Writtingcoherently is one of the most difficult and time-consuming tasks for a human being to undertake.
So far from logs being a cheap strategy, they are a very expensive one, in that they eat up time.
As a result many blogs are not updated, thus damaging rather than enhancing the reputation of the organization.
Organizations are not democracies.
The web makes many organizations looks like disorganizations, with multiple tones and opinions.
Contray to what some might think, the average customer preferes it if the organization they are about to purchase from is at least somewhat coherent.