@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.
The 2017 edition of the official MotoGP videogame brings all the adrenaline and need for speed of the new motorbike world champion with it. The title will include all the 2017 riders, teams and tracks; the new rules and the Red Bull Rookies Cup championship. This edition will reach 60 FPS for the first time, guaranteeing unprecedented performance and extreme enjoyability for the end user. All this will be made possible thanks to the Milestone developers' experience and skills, developed over 20 years of dedicated work to racing.