I admit it, I have a soft spot for sports cards. Over the past year, an embarrassingly steady stream of small eBay packages have been arriving on my family’s doorstep in New Jersey thanks to my 12-year-old’s newfound love for basketball cards. As I think has become plainly apparent to my wife by now, I’m complicit in encouraging this passion—with more than a tinge of nostalgia driving my mind and heart back to my own baseball card obsession in the late ’80s and early ’90s. And I’m not alone. Tra...