True now, but in the olden days we did - at least in a larger degree than now.
Originally you joined to support the team and getting a beer and feed was part of it. Now you join to gamble and get a schnitty and drink.
Also when I was a kid, and before that, a percentage of people would change teams when they moved house.
Now that never happens really, in my experience, say moving from Leichhardt to Emu Plains in my generation, the Dad would be a Tiger and mostly the kids would be but some of that and the next gen would be Panthers.