About Batman Arkham Knight

A litle prologue i am a huge fan of batman series (even liked Origins that a lot of people hate) so it was a sure thing i would buy the game no matter the reviews but i didnt till this time cause i dont like the preorder attitude of companies anyway enough said .... yesterday i broke that rule when i saw at greenman VIP tab batman for 30 euros and that was almost a 50% cut on the price for a new AAA game that has alot of hype and would sell a lot first weeks without that cut plus i know that greenman is not a wierd site like others so i was wondering , why such a big sale days b4 release? You thnk devs saw bugs and bad start full of bugs and inform stores? You think that the test team found the game not worthy? What are your guesses? I am puzzled to see a game with a fan base like that going for 30 already :P