Have you listened to the Grand Ole Opry lately ? Last time I briefly listened, Cacker Barrel (targets senior citizen), a either Blue Cross or United Healthcare ( I couldn't tell which one because I drove into the I 10 tunnel under Mobile bay and missed it) were doing commercials. Someone in the sales department is doing something correct.
They also have a huge streaming audience which seems to be the future.
I don't have access or know of anyone that has access to their financials but they can afford to be staffed 24 7. Or else they VT very well.
IMHO WSM has the best audio processing of any AM station currently available at night in the Southeast on you car radio.