I've open carried in Ohio since the late 80's.
I do not carry openly for any 'deterrent' value. If that happens, great, but I'm probably not going to be aware of that.
And knowing that I won't be able to be aware of my surroundings 100% of the time, having a retention holster is a must.
Is OC for everyone? No. Are you going to be shot as an OC'ing citizen? Statistics say 'no'. Could it happen? Sure.
Will it happen to YOU if I'M the one OC'ing? No, and that is why I don't care what others think of my choice.
If the bad guy decides to shoot me first (instead of the more likely scenario of waiting for me to leave), then all the CC'ers in the store should be happy that I have provided them a chance to realize what's going on, draw their concealed weapons and return fire. Simply use my sacrifice to your benefit.