Certainly not something within the control of OmniGroup (blame Apple), but the App Store “Australia Tax” is a bit of a hit once iOS apps get up over $20 dollars. OF2 for iPad is AUD$38 plus AUD$25 for the Pro pack (AUD$63).
With the OSX OmniFocus - I buy direct from Omni, so I only pay the standard exchange rate difference (and I get the Education price as a teacher).
I still bought it. :-)