[Exhibitman]

Babe Ruth
Mickey Mantle
Jackie Robinson
Michael Jordan
Muhammad Ali
Pele
Tom Brady
Roberto Clemente
Ohtani
LeBron James

Don't forget the rest of the world or the other sports. Their collector bases are worldwide. Also can't omit the moderns; their footprint is gigantic compared to vimtage. If limited to baseball:

Ruth
Mantle
Robinson
Clemente
Ohtani
Jeter
Griffey Jr.
Cobb
Gehrig
Ryan