2. Mark McGwire - $3,000,000
Thankfully for Todd McFarlane, he doesn't really need the money. The man who created the comic book Spawn, which later turned into a god-awful 1997 movie (17% on Rotten Tomatoes) of the same name, just had that Hollywood cash burning a hole in his pocket.
A year after the Summer of Spawn, Sammy Sosa and Mark McGwire were mired in a blow-for-blow battle for the single-season home run record. McGwire took control of the race and launched his 70th homer on Sept. 28, 1998. Four months later, Ol Grand Poppy Spawn paid the highest amount in sports memorabilia purchase history to acquire Big Mac's little ball.
Today, the ball is valued in the $250,000-$400,000 range. Maybe McFarlane can hit a home run with Spawn 2?