Yes and no. Hub score is all about site participation - but if you ignore a part of the site, you won't get the higher score.
So in other words you have to write hubs, read and comment other person's hubs, answer and ask questions, and comment the forums.
Going "hub hopping" is another major thing that lots of people don't do much of.
Truly though - the single best thing to do is to write really good, unique and original hubs.