if your asking what i would have done if i were in a situation like you then the answer is I WILL NEVER SELL BLACK OPS but thats just me. but if your considering selling it there is just one up side to it. You will be able to play Killzone whenever you want unlike in BO you wait for someone to come online to play with like Arif or jeera. Killzone is a awesome game but IMO i'm a hardcore cod fan and will prefer cod over any other game. but sell it now get kz and buy it in april again then. or maybe you won't even need to buy it if you see no one is playing it. Arif is busy nowadays and i think after reaching 15th prestige he also won't play BO that much.