There is a sweet glitch, hack, cheat, whatever , but it allows you to get unlimited Golden Keys in Borderlands 2, and this post will show you how to unlock it!
**This was patched a while ago, but if you are on PC – then good news – there is still a working method, check out my new posts HERE! !**
Close BL2, and steam completely.
C:\Program File (x86)\Steam\steamapps\common\Borderlands 2\DLC\POPremierClub\Lic
Or wherever you have it installed if not 64 bit or still on windows XP.
Then open file: WillowDLC
+NumKeys=255 [PromotionalUnlocks] +UnlockId=2
Save the file and then just re-launch the game. Have fun!
(Anything higher will still yield 255)