They would have sold more if they had not had the massive failure to achieve certification to schedule. Perhaps the FAA have been tougher on Sikorsky than before.
Having said that they started the D development 10 years too late and the performance is almost perceptibly different from the C++.
Against newer products from EC and AW this will just be a cash drain on a company that otherwise has no civil offerings between the S333 (no exactly selling like hot cakes) and the S92.
The D is one good reason for the removal of Geoff Pino.