Ok! one data point ... I hardly ever vote on articles. But upvote good (in my opinion) HN questions and answers. I never downvote anything - what is the point

Ok! one data point ... I hardly ever vote on articles. But upvote good (in my opinion) HN questions and answers. I never downvote anything - what is the point? Stuff that does not garner interest or quality feedback quickly sinks off the top couple of pages. Over the years on HN I have learnt a great deal from other HNers and hope that this continues. The only other site that I hold in similar esteem is StackOverflow but that only for solving specific problems.