@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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One Piece Collection 16 [Z2]
Available for Order Normally dispatched in 21+ Working Days
The harrowing Thriller Bark arc reaches its brutal end with a superhuman slugfest!
Luffy, battered beyond belief, pushes his body past the breaking point as he seeks to save his friends and deliver the decisive blow against Gecko Moria. When the dust clears, only Zoro and Sanji are left standing to protect their fallen captain from the brutish Bartholomew Kuma. Should one of them somehow withstand a savage beating from this behemoth, the crew just might survive long enough for Sanji to meet his dream girl a beautiful mermaid in distress named Camie! After taking her on board, the Straw Hats drop anchor at an island bursting with bubbles in the hopes of equipping their ship for underwater travel. But when Camie is kidnapped, job number one becomes saving their newest friend from the cruel clutches of the Celestial Dragons!