Breakfast might be an exception, but I'm not sure because as Diamond I don't need to worry about that.
The only time I can think of where that'd be the case would be a full-service hotel where they sell some sort of rate that includes a breakfast that Golds/Diamonds wouldn't ordinarily get.
An Easter brunch package or something like that. Granted, most hotels would probably just price it for two to begin with, but it's theoretically possible.