I'm no military aviation expert by any means however a couple points.
1) F-22 Raptors are much more expensive than the SHs
2) Is the US even selling the Raptor? Stands to reason that the US would like to be the only nation flying the most advance fighter around. Though I guess they could sell a crippled version of it.
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1) They are not that much more expensive if you exclude R&D costs. Which the aussies would not be paying for. Think about how much more effective the Raptor is over the Hornet?
2) Currently no it is not(not allowed) and it might never. However since the USAF are getting only 183 jets(for just under $70billion), there has been a lot of recent talk about selling the Raptor to Japan/South Korea/Israel/Australia. This would keep its production line open and therefore drop fly-away costs of the aircraft, giving the USAF the chance for more of their own F-22As.
Military aviation is not only Fast Jets 420. How about this:
The worlds largest aircraft. The Antonov An-225.
This:
SR-71B, still 'offically' the fastest manned Jet aircraft in the world.