Have you ever seen someone repeatedly pull the trigger on a revolver? There is no need to dry fire more than a few times. When you start hearing click click click click click over and over you'll understand
One of the guys at the local guns shops I visit is the worst about this. If you ask to see something out of the case he has to check the chamber and dry fire it several times before setting it on the counter so you can look at it. I don't care that he dry fires it but it drives me up a wall.