@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.
Illidan Stormrage: one of the most powerful beings ever to walk the lands of Azeroth, but also the least understood...
Long ago, the night elf sorcerer Illidan infiltrated the demonic Burning Legion to ward off its invasion of Azeroth. Instead of hailing him as a hero, his own kind branded him the Betrayer. For ten thousand years, he languished in prison-vilified, isolated, but never forgetting his purpose.
Now the Legion has returned, and there is only one champion who can truly stand against it. Released from his bonds, Illidan prepares for the final confrontation in the alien realm of Outland, gathering an army of grotesque fel orcs, serpentine naga, cunning blood elves, and twisted demon hunters to his side. Yet as before, he is assailed by those who see his schemes as a cynical quest for power, including the night elf Maiev Shadowsong, his former jailor. Warden Shadowsong and her Watchers have pursued the Betrayer to Outland to exact retribution for his crimes, and she will not rest until Illidan is in her custody ... or in his grave.