“I learned my craft during the 1986-1992 baseball card, sports card explosion,” Vaynerchuk said on the Jim Rome show. “[I was] the kind of kid making $3,000 at 13-14.

Gary Vaynerchuk is many things: A serial entrepreneur, social-media titan, best-selling author, motivational speaker and thriving digital media CEO. He’s also a total baseball card nerd. And he ...