Thanks for the good advice. I've looked into the Platinum Card a few times but it has never made financial sense given the benefits. Maybe I will go back and look again.
I have a friend who is a great guy but a little status obsessed. Back in the day, he was quite proud of his Platinum Amex. Then, one day he show up to lunch with the new Amex Black Card. I asked him what you get with the Black Card. He said "You get the Black Card."
Yeah. I'm old enough that I got the Platinum back when you had to be invited after first getting the Green, then graduating to Gold. I think it took me 10 or 12 years. Now there really is no prestige associated with it except as a holdover from back when, and you can get one any time with a decent credit score if you're willing to pay the $695 fee. The major credits are Uber $200 (divided monthly), streaming $240 (monthly) and airline fee credit $200 (not good for tickets). If you can use those, it offsets all but about $50. Then you get Delta lounge access (if flying Delta), Centurion lounge access, and a Priority Pass Lounge network access. They also reimburse Precheck or Global Entry fee every 4 years. There's some other stuff but those cover the major points. I get decent value overall. I'm not wasting money but not coming out way, way ahead either. At this point I keep it partly from nostalgia and party because I can get 3 additional Plats for my family for a single $175 fee, which means if we all travel together we're all entitled to lounge access, and more importantly, when my daughters travel alone they access the lounges also. Also, though the extra cards don't get additional Uber, airline or streaming credits, they do each get their own TSA fee credit, which means over 4 years and 4 of us on average that's another $100 credit every year.
As for the Black Centurion card, basically it is 100% prestige. You still cannot apply and have to be invited. It costs thousands every year, plus an even bigger initial entry fee, and the benefits are just slightly better than the Plat, though it's all very opaque. The biggest difference is true concierge service. You need someone to buy a gift for someone else, get concert tickets or an impossible dinner reservation, emergency travel arrangements, or all sorts of stuff like that and they will handle it. You also get some super elite airline and hotel statuses.
I've never seen one in person or - to my knowledge - known anyone who has it. I expect someone, somewhere I know does, but that's just a guess.