Indeed it is, Kerry. I've certainly noticed that what I see at the moment of capture isn't what others see later.
I think T_T is spot on. I don't think it's necessarily about camouflage per se but certainly about blending in. I tried to get a bag that looked a little more "average". I don't care for backpacks but wanted to have more than just a single lens. I don't know that you'd have to be in slacks and a collared shirt so long as you don't look too out of place. I think the goal is to not be a blip on the radar (passed over more than anything) so you don't become a center of focus. I just look like a rough guy that stepped off the mountain after whacking a bunch of trees down so I'm sure I'd scare more people.
I like that idea of the business cards, actually. If you're going to capture their image at least it gives them the opportunity to enjoy it as well if they choose.