If you're truly fatFIRE, consider buying into or opening your own Marriott hotel franchise. I believe you'd get a card that way.

Realistically though, if I had fatFIRE level money, I wouldn't stay at Marriotts (compared to the next tier up, Four Seasons, Rosewood, etc.) and I'd just outright book the best room/property or work with a travel agent to get all the benefits of status without having to do silly things like mattress run 10 nights somewhere every year.