First, let me preface this with, Don't be upset after you read this :D :D
I have over 400+ hours in my logbook, and I NEVER have shut down my aircraft (heck, I've never started it either), When I land at the airport, I just quit the sim, and the hours (at least for me), do add up in the logbook. Now I do run it in easy mode, perhaps that is a factor??