懶人包：
美國運通 AmEx 美版白金卡副卡年費上漲至195美元/人/年
以前如果有4個副卡使用者的話，年費為 175 + 175 = 350 美元 (前三個人只要175美元)
現在則要 195 x 4 = 780 美元
以前會有人把PPS (白金卡副卡)拿出來賣，售價5,000元新台幣左右
如果賣出3張，售價15,000元新台幣，扣除175美元年費之後還能補貼275美元左右的年費
未來由於年費跟人數呈線性關係，所以未來PPS卡至少要6,250元新台幣以上
For Platinum Card® Accounts, excluding
Morgan Stanley Platinum Card® Accounts
For Basic Card Accounts opened on or after August 17, 2023: Each Additional
Platinum Card is $195 annually.
For Basic Card Accounts opened prior to August 17, 2023:
If you were notified of a change to the Annual Fee for Additional Platinum
Cards, each Additional Platinum Card is $195 annually beginning on the
effective date specified in the notification.
If you were not notified of a change to the Annual Fee for Additional
Platinum Cards, we charge $175 annually for up to three Additional Platinum
Cards, and $175 annually for each Additional Platinum Card after the first
three. We will notify you if there will be a change to the Annual Fee for
Additional Platinum Cards on your account in the future.
For Morgan Stanley Platinum Card® Accounts
For Basic Card Accounts opened on or after August 17, 2023: The first
Additional Platinum Card is $0 annually, and each Additional Platinum Card
after the first Card is $195 annually.
For Basic Card Accounts opened prior to August 17, 2023:
If you were notified of a change to the Annual Fee for Additional Platinum
Cards, the first Additional Platinum Card is $0 annually, and each Additional
Platinum Card after the first card is $195 annually, beginning on the
effective date specified in the notification.
If you were not notified of a change to the Annual Fee for Additional
Platinum Cards, we will charge $0 annually for the first Additional Platinum
Card, we will charge $175 annually for up to three more after the first
Additional Platinum Card, then we will charge $175 annually for each
Additional Platinum Card after the fourth card. We will notify you if there
will be a change to the Annual Fee for Additional Platinum Cards on your
account in the future.
來源：
https://www.americanexpress.com/en-us/benefits/additional-card/additional-platinum-card/terms-and-conditions/