Back in the 1970s and 1980s these things were heavily advertised in magazines as "collectibles". The sad thing is that one had to subscribe to their products, which were often overpriced, and the end result was that people were taken in by thinking they had purchased something with a future value when in reality they bought the items at many times what the true value of the product really was. Many novice collectors got taken in by these promotions having later discovered they paid a few dollars for a cover that was only worth a few cents at best.
For further reading, checkout these previous links:
https://goscf.com/t/15611&SearchTer...tive,Societyhttps://goscf.com/t/25788&SearchTer...tive,Societyhttps://goscf.com/t/8712