I'm not sure how it is Virgin's fault? If the terminal can't deal with the volume of passengers through the regular channels at security due to short staffing, how are Virgin supposed to operate priority entry, even if they wanted to?
Sydney is not the only airport facing these problems. For example I became acutely aware of Dublin airport's issues when passing through there last week.
Delays at the airport continued this weekend as many unhappy passengers took to Twitter to document their long wait times and missed flights
www.dublinlive.ie