WTF? This is as good an explanation I’ve seen as any:

“Part of the reason Santo has been left out of the Hall of Fame is that the BBWAA has never quite figured out what to do with third basemen. They are historically underrepresented, and the change in the position over time has made it difficult to establish standards for what makes a Hall of Fame third baseman.”

Maybe he could get in on the basis of his ear flaps.