Pretty simple question, but I can't seem to ponder it being as tired as I am right now -- so I thought I'd just ask and go to sleep and wake up to see all the wonderful responses by you guys. Anyways... say for example you're searching a keyword in AdWords keyword tool, something broad like "make money" (just an example). Now, we all know that all forms of internet marketing come into that niche (the making money online niche)... and you could also have some other slightly related niches like "saving money". The weird part is, Google doesn't have anything with the words "marketing" in the related keywords for "make money online." So, is it worth it building one site based on both those ideas or a separate website for each one? Shouldn't it be basically considered one niche?