Rain Rain Go Away

The rules of Major League Baseball allow the home team to determine if the game will be rained out, up until the game begins. Once the game begins, the umpires are in control.
It has been raining all day, and the forecast is for more rain, yet the Yankees won't cancel the game.
I know they don't want the hassle of a day/night doubleheader but I think their real motivation is to find a break in the weather, start the game, then when the rain resumes the umps will cancel the game and the Mets will have burned Johan Santana.

Update: They finally called the game but way too late. No makeup date is announced so it likely won't be made up this weekend. Maybe we'll have another day night Shea Yankee doubleheader.