According to a study by Jakob Nielson, 90% of users at the average website never contribute a single comment. Just 9% of users comment on occasion, while 1% of users comment frequently.
Although these numbers seem pretty grim, the news is even worse for most bloggers. Nielson calculates that approximately 95% of all blog readers never comment, while 4.9% contribute occasionally and the remaining 0.1% comment frequently. Sadly, given these statistics, odds are quite good that your blog never gets comments, at least not nearly as many comments as you would like.