It was a very "wet" year...if you cut the corn when the ground is soaked, you run the chance of molding your crop and ruining it....lots of money down the drain.
As Hern said, its cheaper to play the waiting game and let Mother Nature do the work.
Also fields could be in a low lying wet area, which would swamp tractors and machinery.
I noticed a lot of icy ponds in what should be corn fields this past weekend