...I'd go so far as to say that even in the age of a pocket knife being nothing but a simple and cheap tool, for every old timer who always sharpened their own knives, there were 20 who just took their single pocket knife to the hardware or shoe repair store for a quick touch up on the grinding wheel.
In what part of the world?
As a kid (which was a few decades ago) in rural Kentucky I knew more than a few old timers who sharpened knives on their *own* bench grinders, but I never knew anyone who took their knives to someone else to sharpen. Perhaps some did this, but I didn’t even know this was a thing until I saw a placard advertising knife-sharpening services in a knife shop in a mall back in the late 70s.
With that said, I pay somebody to change the oil in my cars; if someone wants to pay to have their knives sharpened, it’s certainly no skin off my nose.