The Centurion Lounge is not only a great place to hang out in Vegas since there is no SC there, but it certainly beats any SC hands down for service, amenities and value! Even with the new SC menu, that is a far cry from the Amex Lounges with great HOT meals and TOP SHELF beverages that are included with your entry, either by fee or by Platinum/Centurion Amex Card.
I figured that about 5 or 6 visits to a Centurion Lounge every year would justify the annual fee for an Amex Platinum Card. They just have to add more Lounges quickly to make it a really viable proposition, and they have to be easily accessible no matter which airline you are flying.