@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.
One of Grant Morrison's most imaginative series features a heady brew of big ideas, exotic locales and bizarre action, starring prosthetically outfitted dolphins in scuba gear and a hard-smoking communist chimpanzee. This new trade paperback collects the entire thirteen-issue series plus bonus materials!