Or it could be like me, and everyone I know who is in their 30s and 40s who collected Topps cards in the 70s, 80s, and 90s, and none of that mass-produced shit is worth the price of the cardboard its printed on. Card collecting got SO popular, and Topps was the most popular brand, that almost none of the cards from those decades are even remotely rare. You'd have to have some obscure Donruss or Fleer cards that weren't very popular back then, to be worth anything.
But hey, I still have all my Topps rookies from the 80s...Bo Jackson, Mark McGuire, Roger Clemens, Jose Canseco, etc. They're all worth bupkis the last time I looked.
The 70s 80s were a glorious time...