Here is a question for anyone who finds this blog in the future, at some time. Is is better to have a blog that is all about a single niche, or just fill a large wordpress installation up with content, and trap the passing traffic with a click or a comment.
Most blogs out there are not digested in one huge chunk, but just as seperate posts. One is read, and then the reader moves on. There is not point in having one consistant whole, if that is less interesting and optimised to find search results.
What you really should have is one domain with the maximum amount of novelty as possible. The largest amount of sticky search terms to attract long tail visitors. Especially if the site is not a personal branding site.
Please internet blog authors, just write what you want to write, not what you think people want to hear.