HHI is $3M-$5M with some extraordinary years over $10M
I have 3 credit cards with $100k limits. Amex does have a limit; it’s just that it practically exceeds what almost anyone would spend in a single month, so they never know. We were doing some expensive interior decorating and I tried to put some charges that made them call me before they would clear it. I sent back some tax returns and I now have an Amex that will permit a $300k charge, which I’ve done a few times when finishing the 🏡 . I suspect I am approved for more than that but they won’t tell you the limit. Only that a specific charge will clear.
$600k is more than I could ever need to charge in a single month so that is where I stopped.