Having never sold, I can't tell you much about how radio sales works with or without the numbers. However, I can tell you that more stations than you might think sell without the numbers. Exactly what they use, I don't know. However, a friend of mine is PD for a station that doesn't sell the numbers, and his company is very aggressive about it. Sales people have a meeting every morning at 7:30 AM (and you actually better be there by 7:25). They have to be out of the building by 8:30 and can't return until 1 PM, and, then, they can only return for a very short while. They're expected to be on the street almost all day. Then, there's a final sales meeting each day at 5 PM. That's a lot of hours to work when you're only making straight commission!
By the way, I've heard sports is very easy to sell without numbers. Don't know if KSOP has sports programming, but, if they do, I'd guess they make a killing on it.