And when it comes to monetizing your blog which i'm sure is the main reason why a lot of people are blogging there is a very small earning potential for a personal blog. As we should all know how much you earn will depend on the amount of visitors of your blog so if you can't make at least 100 unique visitors for your blog a day. You can never expect also to earn money.
I'm not saying here that you can't make or a personal blog is useless, my point is there are many other topics that you can choose from. And those topics can also give you opportunity to earn big money with an informative and well made blog. If you have a personal blog right now you can still continue writing on it but i advice you to make a blog that kind of something that people can get lot of information and entertainment.