I can speak from personal experience on this one;
I wrote blog articles and posted them to my personal web site - http://www.goondocks.com. I also never worried much about whether it was already covered in the Sitefinity manual or not. It's good to have multiple perspectives on the same subject.
In fact, I would be delighted to see the same topic covered 40 ways by 40 people. I want to do obscure Sitefinity-related Google searches and see many different explanations for the same topic. When writing a blog post, my goal isn't to write the definitive guide to a topic. Rather, my goal is to add something useful to the larger pool of resources.
"Something useful" can simply be an alternate approach to a common problem. We all approach problems with diverse mindsets. For example, some of us might have heavy database backgrounds. Or heavy PHP experience. Or perhaps heavy Adobe graphical design experience.
These diverse backgrounds cause us to approach projects in very different ways. 30 people can read the same "how-to" article and come away with wildly different conclusions. It simply depends if the reader can empathize with the author (or vice-versa).
I'm rambling a lot, but my point is this; all of us have the potential to write something that is uniquely targeted to people like us. We can contribute something valuable to the larger pool of resources.
Once you've published your blog post, feel free to post a "heads up" here on the Sitefinity forums. You can also email me at firstname.lastname@example.org.
Regarding Telerik points, I received a fair number of points for my efforts (and later a job). However, I didn't get points for every article...or even every other article. Telerik points are intended to be a periodic "thank you", not a tool for directly motivating behavior.
We love to see active community members and I hope we always do a good job of thanking them. However, it isn't our expectation that everyone blog or answer forum questions. Speaking from personal experience, it's a lot of work. I spent many weekends writing articles that very few people read and I never received any kudos. Was this a waste of time? Not to me. I often learned something and I was able to give back to the Internet community that has helped me countless times in the past. Kudos or not, I felt like I was doing something good.
Thank you for your interest. I look forward to reading your posts.