What Gives?

Is there a good reason that Gears of War and Call of Duty 3 are coming out on the same day? It's bad enough of that Gears of War has been doing this whole hype machine Emergence Day thing and then proceed to make if a different day in Europe but both games are out on the same day both in the states and over here. Now you might argue that they both aren't in the same field (even though they both are FPS games). But when you are paying £50 for a title then suddenly the thought of buying two in the same week becomes daunting (as you release you are spending 2p less than £100). Anyway with that in mind I think I'll just wait until Christmas instead and not get either. I do look forward to playing both titles but I'll wait.