On a serious note, there are always going to be crime everywhere.. people that have had their car stole.. a few question tho, did you get a reasonably good immobiliser/alarm? Have you made sure you park where you think are the safest possible location? Have you locked your car? They are very simple things to do and possibly to forget (hell I forget sometime). I live on the gold coast too and have had an old shitter get broken into before (at the front of my house and the bastard came back twice), but that was in labrador close to the aldi. I'm nerver going to live there again unless I have a double garage with the cars safely inside.
Like someone said... if you like to look after your car, you need at a bare minimum get a reasonably good immobiliser/alarm installed by a reasonable good installer. Always lock your car (even if it gets hot out there, shit its better to wait for car to cool down with a/c then coming back with no car).
Always remember if someone really want your car bad, well there is shit all you can do as along as you have insurance.