Most of these products or services let you customize the appearance of your blog, moderate comments, add widgets and do other bloggish things.
They're appealing because they make you feel like a pro -- you're managing a brand. You're "curating" content. You're "designing" a website. It feels like your own personal publishing empire.
The problem is that bells and whistles can distract you from the reason you're blogging in the first place. In fact, they can get in the way, creating a psychological wall of separation between you and your readers, and preventing you from growing your audience as big as you could.
Why do you blog?
There are all kinds of reasons to blog: To share your thoughts and opinions with anyone who might be interested, to get feedback on those ideas, to influence people, to cultivate a community, to start interesting conversations, to practice writing and to teach, learn and grow.
Those are the reasons I blog, and probably why 99% of all blogs were started.
In olden days (five years ago), blogs were "open" and social networks were "closed."
Blogs let you put your ideas out on the wild, untamed Internet for all to see. Social networks, on the other hand, were "walled gardens." Blog posts were public; social networks were private.
In the past year, that situation has essentially reversed, although many bloggers haven't realized it.
The social networks have knocked down the garden walls, encouraging public posts accessible to anyone, even if they're not "friends" and even if they're not members of the social network.
Social sharing has become the de facto way for people to discover content.
Now, if you want to really promote your blog posts, you've got to promote them on social networks. Why? Because social sites like Facebook, Reddit and Pinterest are where the viral sharing of content takes place.
In fact, people now have so much content in their social streams that they're less likely to click over to that blog post. So posting on blogs, then promoting it on social networks, doesn't work as well as it used to.