I agree with your rule of thumb except I look at it from another angle. Jobs was a salesman because while he sold to the masses, he did it on a 1-to-x level, it was about speeches, etc. He basically did what any salesman does, he just did it to huge audiences.
Marketing is about pulling the strings to promote something, not being the guy who actually persuades people.
I personally don't view sales that way. For me sales is a narrowly defined role whose job is to close individual sales - so you can't really do it "to the masses".
Marketing is about pulling the strings to promote something, not being the guy who actually persuades people.