It's a good theory, but I can't agree with it. I think the demographics are probably the only thing that is balanced between countries right now. I think the number of 16 year old burger flippers is likely the same. The cost of an nVidia FX5200 is well under $100. It runs the game well and even the pimpliest pubescent can scam that much out of Mom and Dad in no time.
The daypart section has some merit, but you have to balance that out with the overseas Rooks. I'd have to see the actual numbers to know.
Again, this isn't a "flame the Rooks" thread, just a problem with the game I see that is not fixing it's self.