Actually I think I have been overcharged
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If you are not a member of the Virgin Australia lounge, and have a same day onward flight journey with Virgin Australia, subject to space availability, you can purchase Casual entry for $35 (inc. GST) until 31 July 2011 or $65 (inc. GST) from 1 August 2011 from the lounge reception, and access the lounge a maximum of two hours prior to your flight's scheduled departure time.
Velocity members can pre-purchase Single entry passes at a discounted rate of $30 (inc. GST) until 31 July 2011 or $55 (inc. GST) from 1 August 2011 online.
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They may have switched their system over a little early.