The 360 dominates shooters period this generation. Besides, unless they diverted massive amounts of fund to get it to work on the PS3, they will probably break about even with just the 360 sales and the bit sprinkled in from the PS3 sales will be icing on the cake.
Also like how most Japanese developers still make 360 games in Japan for western audiences, there are usually international territories to think about as well, where the PS3 is more popular.







