Well, 'faster' for the 911 might only be in a straight line - I reckon that around bends, either could be as fast. It's probably up to the buyer's preference for different handling characteristics and behaviour.

As for getting close to the 911, just the same as nobody would spec a no-frills Cayman, who specs a no-frills 911 anyhow? And does the 'price of 911' include onroads and stuff that makes it more expensive still?

Furthermore, I reckon Porsche knew what a weapon they had on their hands, such that the media has been calling it a 911 killer and such. If they made the price too low, they would have made it a nightmare come true. So, make it expensive enough that the value proposition isn't a no-brainer, and keep the 911 as the flagship (CGT notwithstanding).