The geographic centre of Sydney is west of Parramatta. Parramatta is almost at the Hills area.
So I don't think someone living in the Hills is unusual for someone flying out of SYD.
Yes SYD is very convenient if you live in the Eastern Subs or the Brighton Le Sands area.
Bottom line is SYD is a huge city, the traffic is grid locked a lot of the time, public transport is pretty wowful, there are only a handful of lines and they are all over crowded.
From our home its $18 in tolls to the airport (return trip), then you pay for parking etc etc etc. It can take anything between 40 minutes and 3 hours depending on the traffic. Sometimes getting to the airport and back is more expensive than the airfares - even from some Trans Tasman fares.
This is reality for the majority of SYD residents, hence the angst over the cost of parking.
Just adding a realistic different view to this discussion.