There are other bloggers, and I am one of them, who believe there is no harm in designing your blog so that it can earn some income for you. After all, you will spend some money developing your website, and even if it is not very expensive to start a blog, you will need to spend some time doing it ( perhaps a lot of time, depending on how elaborate the blog is.) Why shouldn’t a pleasant past time be used to generate income? It seems a sensible and practical thing to do.