I've wondered about this also, but with sort of a different spin...what of the players who changed their signature style dramatically over the years. I'm thinking of Dave Stewart and Don Mattingly, who had markedly different signatures throughout and in Don's case, several different styles.
How do we account for "value" with this sort of thing? I'd imagine I'd be more inclined toward a "rookie era" Mattingly sig versus a managerial era, but who knows when rarity factors in.
BTW, if anyone has an early career "David Stewart" ONL ball laying around, I just lost one in an auction and am looking to buy.
