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davidcyclebackKoufax's autograph is one of the most expensive for a living retired player. More expensive than Nolan Ryan, Cal Ripken, Willie Mays, etc.
When the autographs are similar in supply, the going value is a reliable indication of the player's popularity and following as anything.
If you follow the modern history of autographs, you will see distinct shifts in value for autographs-- with certain players gaining popularity and others losing popularity. The autograph value for Hank Greenberg, for example, has risen dramatically recently, and a single signed ball is in high demand. Satchell Paige and Roger Maris are hot commonities. Mark McGwire dropped like a stone after his Conressional testimony, and Barry Bonds has more than halved recently. Ted Williams has become more expensive than Joe DiMaggio. Hank Aaron, a frequent signer, will likely rise. Koufax has always been a fan favorite, but his single signed balls have rised dramatically in value of late.