Today columnist Susan Maushart gave some good reasons as to why that might be. Quoting author Richard Florida (Who's Your City?) Maushart writes that choosing a city is like choosing a mate and that cities have their own metabolic rate and their own personalities. Maushart summarises:
Cities...can be categorised as "open to experience" (Melbourne maybe), conscientious (Adelaide, assuredly), extroverted (Sydney - OMG!!), agreeable (Hobart o Brisbane, if you like), or neurotic (Perth, now piss off). Truly - Perth was ranked among the most neurotic cities in the entire world. Turns out it's all about Perth's extreme isolation, and the unique mental trade deficit that goes with that. Basically, we export the sort of people who week social engagement with the wider world (the young and the functional) - while attracting the sort of people who seek divorce from the wider world. And in most cases, the differences really are irreconcilable.
So, don't take my word for it.