An edited quote from the accident report by ATSB makes interesting reading about the history of Night VFR.
"When flight under the night VFR was first approved in Australia in 1967, it was developed with the intent that pilots would still be conducting the main part of their flying in daylight hours.
It appears that this has altered over time to include a much broader use of the rating. Flights are now routinely undertaken and completed between the hours of last light and first light by pilots with Night VFR ratings alone.
Night VFR flying is more demanding on the pilot and in some cases requires substantial instrument flying skills. A night VFR rating does not require a pilot to haveany substantial instrument flying experience. Studies have indicated that less experienced and non-IFR rated pilots are more susceptible to spatial disorientation when inadvertently entering IMC than more experienced pilots."
A Night VFR rating may get you ahead of the mob in the hunt for a job but under dark night weather conditions with no horizon it can be a risky business. Far better to save your money and get a command IR where your instrument flying skills will increase with IMC flight. In fact it could be argued that a pilot would be wiser to get an IR first then proceed on to a Night VFR rating later. The skills gained in the IR may save your life on a Night VFR trip outback.