I grew up hearing Paul Harvey when I was sick and missed school (always associated him with the chicken soup I had to eat) or during the summer. He didn't do as much advertising in the 50s and 60s as he began to do later. But that's true of all TV and radio programming. Some cable/satellite programming today is more than 35 percent ads.
As for Harvey being a sales guy, he did sell, but critics admitted routinely that he did believe in what he sold, and usually used it. Anyway, I am aware of only a few celebrities today - liberal or conservative - who don't hawk something.
Harvey's broadcasts were aimed primarily at rural listeners, a lot of them farmers. He talked about things that interested them, and they were conservative. The decades his program ran was proof that he knew his audience and they liked him. I always enjoyed his daily bit about some very unusual crime - like the Mississippi teens that swiped a highway bridge. They did an incredible amount of work and actually put out warning cones to keep anyone from wrecking. Great story.
Politically he was conservative, and made no bones about it. But he was a lot less nasty in his comments about those with whom he disagreed than the fanatics on both sides who darken radio and TV today.
I enjoyed his program, agree with him or not.