The problem comes with articles that are regarding exams, applications and information regarding a place or an event. Writing comments for these articles are not easy apart form saying 'Nice article, I thank the author etc'.
The article section is also reviewed very systematically, if a reply is just yes,yes then we might lose points, if we really understand the article and comment in a relevant manner that adds more information in a manner that enriches the article further, then it's bound to get some cash credits with or without a reduction in points.
I like to comment on articles because, I read for my own knowledge and then recollect the previous facts related to the article, I sometimes check the websites, and specific points and then comment.
Honesty is the best policy.