I've had people buy games on my console before and it's never worked. It definetly doesn't work on the Black OPS dlc, now it even kicks you off the map while playing if the owner recovers their gamertag.
Pinball FX2 secret:
If someone buys tables on your console they stay unlocked for you after they recover their gamertag on another one. I have gotten 9 free tables so far, because my friend is nice enough to buy them on mine first.
redeemed HJPFJ-DMGY9-P3DVM-RKGPR-9PMPZ
Thx DaChicagoBear1
@AlphaPanda - I realized it had been 3 hrs I was just a little disappointed :) Guess I just had to wait another 15 minutes