@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: Stand Alone Complex - Solid State Society [Z2]
Available for Order Normally dispatched in 21+ Working Days
The year is 2034 and the face of terrorism has changed. Two years have passed since Motoko Kusanagi departed Section 9, Japan's elite anti-terrorism unit. After a wave of audacious ghost hacks, the Section 9 team's investigations lead them to an ultra-wizard hacker named the Puppeteer. Meanwhile Batou encounters Motoko once more. She warns him to Stay away from the Solid State Society. No one is above suspicion in this feature length continuation of the Ghost in the Shell saga from the acclaimed Production IG Studio (Kill Bill, Ghost In The Shell 1 & 2, Blood The Last Vampire)