The American Express (NYSE: AXP) Platinum card was the original “high end” credit card, and has been well-known as a symbol of luxury and affluence since its introduction more than 30 years ago. Recently, American Express announced that its flagship product was increasing its annual fee by $100, from $450 to $550. However, the card’s benefits have been sweetened as well. So, is the Platinum card still worth its cost?