GT5 commercial advertising hasn't started yet, anywhere in the world.
In a couple of weeks it will be 8 weeks from the release date, and PD should start trickling down advertisements here and there before swarming TVs, Gamestops, NASCAR, magazines, and other places around the world. Then the pre-orders will pick up. Up until now, they haven't done any commercial advertising other than small conventions like E3, GC, and soon to be TGS. Once the word gets out that this is REALLY the ACTUAL release date and the advertising begins, I'd expect to see pre-orders start climbing into the tens of thousands.
Besides, GT has always been a series that sells less than 20-25% first week, unlike a HUGE majority of other franchises out there. Thats why people claim that it has such 'legs'.
