From The Truth About Guns:
I often open carry, especially in the summer when the temperatures make concealed carry a bit more cumbersome. I was open carrying at this Yuma, Arizona gas station when a man approached me. He asked if Arizona is an open carry state. I told him it was, and went on to explain that most states were. He said he was from Colorado, where open carry was forbidden in some cities.
The encounter illustrates an often underrated advantage of open carry: it’s an excellent way to meet interesting, mostly friendly people who are potential allies. About 95 percent of the contacts that I make while openly carrying are amiable and curious, as this gentleman was.