I am wondering the exact same thing....
I have chose to open carry, and would like to meet others that do the same. I get the impression that it is extremely rare.
I have been doing my own little survey of cashiers in various retail establishments and fast food joints. I ask how long employed and how many if any open carriers have they seen.
No one has said more than 2,and most say they have not seen anyone doing it.Until me of course!