Mainly respect and to prevent any problems in the event in the officer is badge heavy, runs my license, and realizes I didn't inform him I may be carrying. And my wallet was next to my gun so again it was mainly a respect thing.
Good point. I would likely do the same, out of respect and, on the off chance he saw it while reaching for my wallet, and thought I was reaching for the pistol.
I try to keep my wallet and carry far enough apart that this wouldn't be an issue, but it isn't always possible.
Thanks for sharing your experience.