Thanks for sharing this. I am not sure about how the reputation works, but I think that being constructive as well as active generally describes a person that has built up a good reputation. Other than being a good author, or a whale of course.

From your post, I've realised how much more interaction I could have, so I've decided to try some of the things you suggested. I don't know if I will be able to make 100 quality comments in a day, but I will most certainly try!