Try to remember that guns are expensive tools, and in hard times, most folk have to make hard decisions about what to spend their money on- a new gun is very nice to have, but would get much less use than a new horse or plow.
Of corse that only applied to lawful folk. You got to remember that law enforcement was almost non-existant. So was comunication. A new gun I suspect got quite a few new horses and gear for folks (especially when in a blood feud) if you shot the lonely rider no one was the wiser. I also suspect that in areas where lonely riders went missing folks were willing to spend the extra dough on a gun (especially when in a blood feud).