Discovering a profitable blog niche should be an action carefully researched before acting. If you’re only purpose is to start a blog about your family, then obviously it doesn’t matter what subject you cover. On the other hand, if you’re wanting to make money from blogging, the niche you choose is very important. You’ll need to know how much competition there is in a niche, how well does it pay, are there any affiliate programs for your niche and so forth.