@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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The Walking Dead: A Telltale Games Series - A New Frontier Season Pass Disc
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The season will begin the tale of mysterious newcomer Javier, while also continuing the journey of young survivor Clementine as they both search for answers in a world ravaged by the undead. The Walking Dead is set in the world of Robert Kirkman's award-winning comic book series and offers an emotionally-charged, tailored game experience where a player's actions and choices affect how their story plays out across the entire series.