Dave, I think you will find that initially, when the Execs were planning the club - a national club was and administration nightmare - thus the NSW only.
Just becuase the name is NSW - doesn't mean that members are limited to NSW residents.
I think Victoria and Qld are starting clubs too - maybe not formal ones (ie proper not-for-profit Company Names - pty ltd) Maybe they are - not sure here.
A National Club would be tops though ! More members, more benefits !
Maybe one day when all states are registered , there will be an umbrella comittee with National presence but local management ?? I dunno !
From an non-commitee members perspective (I'm a member only) - It's been a pretty hard slog just to set up Skylines Australia NSW.
I'm sure the Exec Commitee can comment more on this though !