I started following box office in general WAY back in the 90's ... would always follow the weekend box office #s on Showbiz Today each week on Monday afternoons, back when films like Independence Day, Twister, etc. came out ... so what, 1996-1997. The discussion on those shows back then seems archaic when thinking in today's world. Once had more internet access in the late 90's, early 2000's mostly followed reports from Gitesh and just stories on yahoo each week.
In 2005 or so, before Sith, I found Boxofficemojo.com ... followed stuff on that site ... then in 2006, found WorldofKj where I began being intrigued by the 'yahoo review' box office phenomenon ... one of my earliest recollections on that aspect was in 2006 when Poseidon was an utter bomb ... and then MI3 was really disappointing a few weeks later.
I was addicted to following each week ... and hell, every day or so since.
Of course, still haven't posted on KJ ... and just recently started posting here, despite being a member here since pretty much when it was created.