Sponsorship: 10 clubs in a city of 4 million vs 2 clubs in a city of 5 million. VIC clubs would have much harder time with the competition it brings.
You really don't have a very analytical mind do you.
Sponsorship.
Melbourne - 9 AFL, 1 NRL, 1 SRU, 2 AL = 13 clubs
Sydney - 2 AFL, 9 NRL, 1 SRU, 2 AL = 14 clubs
Melbourne population more like 4.5million Sydney 4.9million.
Melbourne arguably has 10 teams as Geelong really acts as an outer suburban club. If it were as far away as Mildura or Portland, it probably wouldnt survive.
Anyway, continue!