[philpem]

Whether something is a collectable depends on whether someone (ideally several someones) is willing to take it or pay for it ... apparently in this case, they weren't.

Comparing a periodical to a mint shrink-wrapped MTG card isn't really a fair comparison. Even back in the day, most libraries didn't keep periodicals, they were "scanned" (photographed) onto microfiche at the end of every year or two to save space. Some stuff just takes up too much space to store, or isn't practical to when the information is of limited value or already present in another form.