I'll typically hit TSF once per day, looking for something time-sensitive and, if I see it, reading that. If I don't, I'll bounce off. I usually visit the other articles on the weekend, which is where/when I read TSF the most.
What strikes me as odd though, is that 'coverage' is, I believe, a less time-intensive task than 'interviews', which is where you seem to be spending most of your time. While I value the in-depth articles, it would take less time to review new / launching / just-launched sites that I just happen to want to see more of.
Regardless, TSF is a staple that I recommened to all. I'm a little amazed to see that your revenues didn't increase more, month to month, but that speaks to the necessity of dogged persistence required of startup founders, I suppose.