What is the offline equivalent of "clickbait"?
Solution 1:
These types of lures in advertising can be referred to as "come-ons", as defined (#1) by MW-O:
Full Definition of come–on:
1: something (as an advertising promotion) intended to entice or allure
2: a usually sexual advance
A great example of a come-on that boosted interest and sales for DC Comics is described in Geoff Williams' article in Entrepreneur Magazine:
Company: D.C. Comics Year of the Stunt: 1993
The Stunt: Whether we're talking art or not, D.C. Comics is--yes--a business, generating approximately $40 billion in revenue each year. So it's not surprising that many people felt that releasing a comic book called The Death of Superman was a marketing stunt, given that nobody with half a brain really, truly thought this company was going to stop producing its most popular title, a hit since the Superman character was born in 1938. (According to a recent estimate published in Entertainment Weekly, since that time, Superman has generated some $4 billion in revenue.)
What Happened Next: The news media covered this development extensively, not quite as if a head of state had passed away, but seriously enough, and the comic book featuring his death sold out on the first day. As more issues were published, they kept selling out. In fact, millions of readers purchased not just The Death of Superman issue but numerous others that followed, including Funeral for a Friend and eventually--who would have guessed?--The Return of Superman.
Lesson Learned: If you have a popular product but feel that sales are stagnant or your customers' excitement toward the brand is weaning, it may not be a bad idea to tinker with it. "Well, not so fast," you're probably thinking. "Jump into a time machine and see how people felt about New Coke in 1985." But that wasn't a marketing stunt--it was a colossal business mistake that offered numerous marketing challenges, which Coke eventually conquered, by reverting back to its original formula. Businesses revamp their products all the time, whether it's coming out with a "new and improved" formula that truly is new and improved (unlike Coca-Cola's 1985 misfire). But more often than not, instead of replacing the product, companies now just add new varieties to their line. What Superman and other beloved brands can teach us is that if you can create some drama around your product--and tug at your consumers' emotions--you may just find that your potential for bringing in a profit is, well, super.
Solution 2:
I found this definition of sensationalism:
Sensational writing or language; the presentation of matters or details of such a nature or in such a manner as to thrill the reader or to gratify vulgar curiosity: as, the sensationalism of the press.
The Century Dictionary and Cyclopedia, 1914
It does not, however, refer to merely physical items. Here's passage demonstrating its usage:
It is pleasant to me to observe, Watson, that you have so far grasped this truth that in these little records of our cases which you have been good enough to draw up, and, I am bound to say, occasionally to embellish, you have given prominence not so much to the many causes celebres and sensational trials in which I have figured but rather to those incidents which may have been trivial in themselves, but which have given room for those faculties of deduction and of logical synthesis which I have made my special province."
"And yet," said I, smiling, "I cannot quite hold myself absolved from the charge of sensationalism which has been urged against my records."
[flourish omitted for brevity's sake]
"You have erred perhaps in attempting to put color and life into each of your statements instead of confining yourself to the task of placing upon record that severe reasoning from cause to effect which is really the only notable feature about the thing.
The Adventure of the Copper Beeches by Sir Arthur Conan Doyle for Strand Magazine; published in June 1892
Solution 3:
In terms of journalism specifically, you may be interested in yellow journalism:
Yellow journalism, or the yellow press, is a type of journalism that presents little or no legitimate well-researched news and instead uses eye-catching headlines to sell more newspapers. Techniques may include exaggerations of news events, scandal-mongering, or sensationalism.
This certainly fits your “before the advent of the computer” bill; if I remember my history classes well, this term originated around the Spanish–American war.
Solution 4:
How about a hook
http://www.merriam-webster.com/dictionary/hook
"Something intended to attract or ensnare"
Example: from "How to Write a Good Hook" http://bid4papers.com/blog/hook-for-essay/
"When you are asked to write an essay that works, it doesn’t mean it should be boring and too formal to express your thoughts and creative nature. Every author and storyteller will agree with the fact, that you should write for the audience first of all. What does it mean? It means that your task is to grab their attention and make them want to read your essay till the very end.
That’s the reason why essay hooks exist.
An essay hook is the first one-two sentences of your essay, its introductory part, which serves to grab a reader’s attention and let him decide whether he wants to continue reading this essay or not."