This industry trade magazine ad from MCA-TV, circa 1983, boasts of the popularity of Buck Rogers In The 25th Century in syndication, specifically in weekday daily airings (known in syndication as "stripping"). While I'm sure that the series did do well in some markets, the "Is a cult developing?" line seems more like wishful thinking on the part of MCA's marketing department.
I suppose it does have a cult following now (and if so, I'm certainly a part of it), but in '83? A mere two years after it ended its network run? I love the show, but Star Trek it ain't.
Thanks to Star Kid Peter Noble, for sharing this ad on the Space: 1970Facebook page. Here are a few more MCA trade ads, also courtesy of Master Noble: