Just dropped one (414A) off the certificate after many years of service. We are in the west, much different environment than NY, but the aircraft's drawbacks were catching up with it. Out of Jackson Hole IMC at night on life flights was a scary thought. There was still a very limited, maybe one or two per month charters in our area, but not enough to justify the aircraft.
A big factor is that our customers are usually willing to pay for turbine, or not willing enough to pay for the 414.
Also, staffing was getting difficult. Our open pilot policy was 2000tt. Anybody who was qualified wanted turbine time.
Having said all that, we have a nice 414 for sale!