Completely worthless now

Baseball cards.

In the early 1990s, pricier, more polished-looking cards hit the market. The industry started to cater almost exclusively to what Beckett's associate publisher described to me as "the hard-core collector," an "older male, 25 to 54, with discretionary income." That's marketing speak for the Comic Book Guy from The Simpsons. Manufacturers multiplied prices, overwhelmed the market with scores of different sets, and tantalized buyers with rare, autographed, gold-foil-slathered cards. Baseball cards were no longer mementos of your favorite players—they were elaborate doubloons that happened to have ballplayers on them. I eventually left the hobby because it was getting too complicated and expensive. Plus, I hit puberty.

It's easy to blame card companies and "the hard-core collector" for spoiling our fun. But I'll admit that even before the proliferation of pricey insert cards, I was buying plastic, UV-ray-protectant cases for my collection. Our parents, who lost a small fortune when their parents threw out all those Mantles and Koufaxes, made sure we didn't put our Griffeys and Ripkens in our bicycle spokes or try washing them in the bathtub. Not only did that ensure our overproduced cards would never become valuable, it turned us into little investors. It was only rational, then, for the card companies to start treating us like little investors. The next wave of expensive, hologram-studded cards didn't ruin collecting for us—we were already getting too old for the game. It ruined baseball cards for the next generation of kids, who shunned Upper Deck and bought cheap Pokémon and Magic cards instead.