I'm sorry, but I must call you all old fashioned. I take my drivers license out of my wallet, put it in my pocket, and put my wallet in my carry-on bag. I prefer not to be "that guy" standing at the screener having to unload his pockets while everyone waits. To me, courtesy means you unload your pockets ahead of time and put your items you know will set off the buzzer (this may or may not include your wallet) in your bag, then proceed through.
Perhaps your pure black metal credit cards may catch the eye more than my lowly plastic silver card, but you could always be a gentleman (and or gentlelady?) and take your metal card out of your wallet, bury it within your bag as to not set off the machine, and when you're sitting at the gate, put it back in your wallet.