When you create a niche blog, having a custom domain name is such an edge, because instead of having a domain name like this www.quicktips4tech.blogspot.com, you will have www.quicktips4tech.com. Thus, it makes your blog domain name looks like a pro site, though you are just a newbie in blogging. It adds up the marketability of your blog. You can have your own custom domain name by purchasing a domain name. Eg. godaddy.com.