Not very and that's not my point. I'm not denying the SFS is a brilliant RL ground but it's accessibility is a major factor in people not attending. On a night like Friday with the weather a hard enough factor to work around, I drove there and as I said, departing the Central Coast it took me 2.5hrs, a journey that SHOULD take me far less time. ANZ has never taken me more than 1.5hrs. As for public transport to the SFS - not having a train at the door is a major setback in the minds of many. Fact of life, nothing to do with me, it's a general observation about how people demand more in this day and age.
So, Souths fans and that's it? The fan bases of all the other clubs who are tenants of that ground need not use Parramatta or Victoria Rd AT ALL. The Bulldogs fans, most Tigers and Eels fans travel from the West or inner West and the best access for Saints fans is over the M5 East and up the Metroad 3.
I love the fact you've mentioned in your post that ANZ is an absolute pain in the behind to get to "from Sydney"... that's not where RL's core support is in the metropolitan region.