@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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Doctor Who: All Doctors And Companions PX Coffee Mug
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No matter where the Doctor goes in time and space, there's one thing that's a virtual certainty: the Time Lord needs his tea! Now you can fuel up for all your timey-wimey adventures with this stylish mug featuring all of the Doctors and his companions!