While fiddle-farting around in Cancun back in the early 90's, my brother and I decided from the get-go that we wanted to be working divers, so we logged dives dilligently from dive #1. I'm sure he stopped logging after hitting Divemaster and going to work, but I kept logging well into being an instructor. Then one day I needed a new logbook, and just said, 'screw that', and never logged again. That was sometime in the mid 90's, somewhere shy of 2000 dives, and I continued working in the W. Caribbean for several more years, and got cave certified, so I have no clue how many dives I might have (but somewhere in that 2500-4999 estimation, surely not any more).
As I recall, very few working divers that I knew, bothered with logging dives.