Bit of anecdotal evidence from the UK:
Me: There is a new 40GB PS3 coming out for £300.
My Friend: Really? Im going to get it.
Me: It doesn't play PS2 gams though
My Friend: Who cares, I'm not buying a PS3 to play PS2 games.
That has happened with everyone I have told. Maybe BC is more important to US people than it is to European's. It would explain why the PS3 is selling better in Europe.