It's totally understandable that commenting is lower but make no mistake about it it normally takes much less effort to read a topic and write a good quality comment back to it. Creating the article and thinking about what to write and structure it out can take a hour + while a comment about 5-10 minutes depending on the length.
Very good way to make some extra LEO and Hive by commenting. Some days you might not feel like writing a full blown article so commenting and curating earn you a good deal for the day.