The offshore industry is driving to heavy expensive options, so the weight and price of all helicopters goes up and payload goes down. The AW139 was blessed with a series of gross weight increases, otherwise a 4700kg aircraft trying to operate at the original 4200 wouldn't have much payload either. The D is in an airframe already maxed out from the original 10,500 lb gross, so payload challenged compared to the C++ or even the A++ (though those aircraft don't have the same bells and whistles). Heavier to mitigate a highly improbable risk isn't safer.
You'd have to really want a D to buy one, 139's are dirt cheap on the market right now.