In Chicago we kind of got a kick-start for old shows coming back in the mid-1980s, because we got two "new" local independent stations, Channel 60 (now Channel 50) using the frequency of the former Sportsvision (now Fox Sports Chicago) and Channel 66 (formerly the pay channel Spectrum). (Channel 44 also went "pay" and became ON-TV, and when that folded they went Spanish.) I found that when a new station started up, they began by running a lot of old "classic" shows, probably because that's what they could afford. A lot of the shows mentioned above showed up on Channel 60 in Chicago in the mid-1980s, several of which had not been seen in Chicago for a good number of years. Then I guess as these stations become solvent, they move on to stuff that's more commercial. It's the same with cable channels now, like the Game Show Network, Cartoon Network, etc., they generally start out running classic stuff and then eventually transition to original programming.