The the reason the AFL do the blockbuster draw (as the SANFL used to in it's heyday) is that more people watch and attend and while that also means $$ it's also entertainment for the fans.
These ideas about split groups based on last year's form or geographic location of home grounds still don't achieve fairness as you still have some teams playing twice and some once. It's just that we feel better because we don't have the blockbuster policy.
@Mr 66 - you could set 2 groups based on that criteria and then find form changes from last year and suddenly you have an unfair advantage you hadn't anticipated and you are no better off than under the current policy. The ladder placings are never the same from one year to the next.
I think you've got to have 2 showdowns, 2 derbies, 2 GC v Lions games. As I said before, no team IMO will win a premiership because of advantages in the minor round draw. Also, if you compare it to US sports at least every AFL team plays each other at least once every season! I hate the tiny little groups they break their competitions into.
Clearly, I don't see the draw as the big deal others do. Sounds like I am in the minority.