I am currently researching the possibility of getting an AMEX Platinum card. The annual fee is high but I like the option of getting into Airport Lounges. Annual fee is currently $450 for the personal card and it's an additional $175 for another 3 cards. The total comes out to $625 for 4 cards which is about $155 each. Since it is my credit and my responsibility, I would want at least $200 for the annual fee, and obviously, I would not let you use the card whatsoever for purchases. It would be strictly for getting Platinum benefits.
I'm still not sure if I want to do this, but I am "testing the waters" here to see if there is an interest. So, if you are interested in splitting AMEX Platinum and getting yourself Platinum Benefits for $200 or a little more per year, kindly let me know.