Well, people blog for different reasons. I started about two years ago when they were just starting to become more well known. I did it to stay in touch with customers after a few moves. Then, it was a way for me to get in my daily writing fix (still is)...now, I do it for a way to "get my name out there" and to help enable all you other stamp lovers.
Part of my DT fun is showing what I can do with the companies products.
Overall...blogs are a TON of work (to post every day) and a person really has to be doing it for the enjoyment and for themselves...the rating thing...I did it for a bit (It was nice validation) but I got too hooked on my numbers going up and going down...so I got rid fo the rating scale. (I don't mean to say that the rating scale is bad...there are some good reasons to have it...especially if your blog is business related.)
Anyway...I do it as an extension of my "job" AND I do it for sharing my love and excitment of crafting...so it is fun for me!
HTH