Talk about apples and oranges! Local radio and network television are completely different. People watch late night network TV in numbers far greater than listen to late night local radio. That was true back in the sepia-toned days of your nostalgic imagination, too. And the people watching Carson were much more attractive to advertisers than the audience for Nebel. Advertisers and agencies are much more savvy today, thanks to research tools unavailable in the "good old days." They're not going to waste money trying to sell ANYTHING to a bunch of graveyard-shift radio listeners.