Quote: Chuzz "As for the format I don't see why the matches have to be decided so early, Why can't it be a 1st plays 2nd - 3rd plays 4th etc... Keeps it competitive and makes nearly every game an important 4 pointer. Maybe set the match ups 3 weeks-ish in advance to allow coaches to prepare. So go on the position at week 10 or 11.'"
Simple, because it's all about the crowd. If you wait until 3 weeks in advance before deciding what the games are based on league position, fans don't know if they are playing on the Saturday or the Sunday, so will withhold buying tickets (except those going for the full weekend). There'll then be a 3 week mad dash for people to buy tickets for the day their team is playing on, as well as potentially booking hotels and transport.
The only way you could leave the exact matches until later in the season is if you picked 6 sides to play Saturday and 6 sides to play Sunday early on, and then decided the matches from those 6 closer to the day.