I suggest it is because in many areas there are what we call GHOST repeaters on 2 meters. The local coordinating council granted owners of original 2 meter repeaters a pair; yet they have been off the air for 10-15-20 years and the council will not resend them. Another tid bit I found out was the cost of 440 duplexers and the size are much easier on the back and pocket book. Next, most of the new repeaters are on Fusion or DMR or even P25 or NXDN, D-Star pretty much died on repeaters but is still alive on the HotSpots and in Florida. Your Opinions Welcome.