Until the advente of the Internet, TV- related magazines were big business. The Internet Movie Database didn't exist, so fans of television series, movies, actors and actresses corresponded through the pages of TV and movie magazines. In Australia in the 1950s and 1960s, we had 'TV Week' (still going) and the sadly long defunct 'TV Times'. 'TV Times' was published by the ABC and the better of the two by far, one reason being that it was close to current A4 format while 'TV Week' back then was little more than digest-sized format.
BUYING TV MAGAZINES
It was common for fans to clip articles from TV magazines, so be sure sellers declare in their listing that all pages are present and complete.
SELLING TV MAGAZINES
Be sure you check all pages for faults as mentioned in 'Buying', above. List issue number, volume number if shown, and or date, and number of pages. Include details of TV show or TV star articles, or better still, 'google' the title to see if there's an index online and if so, include a link to the inded in your description.
COLLECTABLE TV MAGAZINES - A Personal View
Collectability is an ever-changing thing. What's collectable now may not be so tomorrow. However, back copies of both 'TV Week' and 'TV Times', especially from the 1956-1976 period, will always be popular. Bound volumes occasionally appear on eBay and command high prices. There are many other TV-related magazines apart from these two so-called program guides. The majority these days are related to cult interests, like 'Buffy', 'Stargate' and 'Doctor Who'. The best known in the 1970s was 'Starlog', once very collectable.
FINALLY, if you have any questions, please contact me. I hope to expand it to cover a guide to collectable titles at a later date.