Do bloggers write for bloggers?

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While analysing the origin, the evolution and other statistics of the traffic generated by some of my blogs (either thought the use of some java scripts, either by looking at the portofolio of e-mails of my subscribers, either by looking at my feedburner's stats) i've realized that probably 80-90% of my blogs'(overall) 550 unique viewers/day are also bloggers. Could be this situation determined by the fact that I own some niche blogs in a niche language? What do you think? Do bloggers write for other bloggers or for people that have no idea about blogging...