Well, it's actually not 'new', but seems to have really become more common over the last decade or so - the industry pro's that have chimed in will correct any discrepancies in that post-haste.
Speaking for myself, I addressed it earlier in the thread.
The advertising business in general has vastly changed in the past decade or two.
And it's dried up in the last six months. Right now, advertisers only care about highly rated stations in their target demo between 6AM and 6PM Monday-Friday. If that's all the advertisers care about, that's all the radio stations care about. If there was another revenue stream, things would be very different.