Why BC is not critical for the PS3 ???

[Zero Hero]

I find it funny how people say that Sony lied. Did Sony Launch with BC? Yes. Can you still get a PS3 with BC? Yes.
Now people have the option to get a cheaper PS3 if BC isn't a concern of yours.

I wonder where that $100 difference comes from? Maybe the $100 for a 360 20GB drive so the Core(cheapest, no BC 360 SKU) can have BC. Did MS set the price for BC?

Nah, that makes too much sense.