@SupaPhly part of the reason could be that they are more responsive to FOREX fluctuations than MS or Valve. The other reason is that we are so small for Sony that they can't be bothered to match what happens on the other platforms.
If you have both consoles it allows you to price shop, i've picked up a few games this way.
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Ghost In The Shell [Z2]
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The year is 2029, the world is made borderless by the net; augmented humans who live in virtual environments. Watched over by law enforcement agents that are able to download themselves into super-powered, crime busting mecha. The ultimate secret agent of the future is not human, has no physical body and can travel freely through the information highways of the world. Hacking and manipulating whatever, whomever and whenever required...