One is that you get the chance to comment on any of the blog articles. It's not because I want to know who you are - unless you tell me in your public profile, I can't see that info anyway - but to prevent 'comment spam', which is a direct equivalent of emal spam, where thousands of comments are dumped onto the blog redirecting readers to amazing, once-in-a-lifetime offers...
The second reason to join the community, is if you want to subscribe to this blog by email, to get new articles into your inbox whenever they are published.
To sign up for email alerts, use this page, and you'll start receiving new posts as soon as they are published.
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