They made one comment that American Express would not publicly discuss their BLACK CARD, but only several hundred AMEX Cardmembers had one!! The show said it took $250K net worth to get a Signature Card and that 1/2 of 1% of all Visa cardholders have it - it offers no preset spending limit and concierge service. The Millers took full advantage of Signature Concierge when one call arranged a limo and lunch in Wine Country north of SF. OK....I thought anybody could get a Signature Visa. WHICH IS THE MOST PRESTIGIOUS CARD ? I vote for American Express Centurion Card.