They are worth something. How much? That depends. I sold about 200 issues of Stereophile and Absolute Sound at a garage sale for $50. A woman bought them for her husband who had just retired. She said he needed a hobby.
That's equipment, or parts and top of the line stuff. To really be worth anything it has to be special now and kept in pristine condition. I know some really rare stuff can be restored, but for the most part the "good stuff" of the future, is the good stuff now.