The most used example is golf. Golf has a relatively low number of viewers, but most of those viewers can afford to buy the luxury goods that are advertised.
Ergo, the advertisers get the best value for their money in hitting that demo.
My guess is radio stations seize upon whatever local venue there is to grab the local listeners' attention whenever possible. Now they have a sports demo to sell to advertisers.
Plus, there's probably listener fatigue to take into account too. Nothing but politics wears one out.
I'm ready for another death pool, elevator-music-from-hell, some non-political author, or even a celebrity-promoting-a-charity/cause segment to get away from politics for an hour.
I justy got in. Have I missed chumps yet?