are tax deductible. Essentially most of the cards out there offer a rebate of 1%. This can be had in the form of straight cash, airline tickets, or other products.
The Amex black card has a 5K initiation fee and a minimum spending of 250K per year. The main benefit of this card is the prestige of owning one. The AMEX platinum has an annual fee of 450$ or something like that and offers multiple reward plans, has a concierge, and itemizes your year end statement which I find very useful.